Technitium DNS Server Change Log

Version 11.4

Release Date: 12 August 2023

Added support for DNS over PROXY protocol version 1 and 2 for both UDP and TCP transports. This feature allows using a load balancer or reverse proxy in front of the DNS server such that the client's IP address information is passed to the DNS server. This can also be used to provide DNS-over-TLS service with a TLS terminating reverse proxy that forwards request to TCP-PROXY protocol port.
Updated TLS certificate implementation to allow the TLS handshake to always send the certificate chain.
Updated Backup and Restore feature to include Web Service and Optional Protocols certificate files when they exists within the DNS server's config folder.
Added DNS server uptime info in the About section.
Multiple other minor bug fixes and improvements.

Version 11.3

Release Date: 2 July 2023

Added support for URI record type (RFC 7553).
Added support for dohpath parameter for SVCB record type (draft-ietf-add-svcb-dns).
Added support for configuring generic parameter for SVCB & HTTPS record types in UI.
Added feature to allow converting zone from one type to another to help scenarios like upgrade of a secondary zone to primary zone when decommissioning the existing primary zone.
Updated primary zone NOTIFY implementation to keep rechecking when notify fails and explicitly show notify failed status against the specific name servers in the UI.
Zone Alias App: Added new DNS app that allows creating aliases for any zone (internal or external) such that they all return the same set of records.
Multiple other minor bug fixes and improvements.

Version 11.2

Release Date: 27 May 2023

Added support for SVCB and HTTPS record types (draft-ietf-dnsop-svcb-https).
Added support for managing unknown (unsupported) record types.
Auto PTR App: Added new DNS app that can generate automatic responses for PTR requests.
Weighted Round Robin App: Added new app to allow returning responses with weighted round robin load balancing.
Multiple other minor bug fixes and improvements.

Version 11.1.1

Release Date: 1 May 2023

Fixed issue of UDP socket pool exhaustion on Windows platform causing all outbound UDP requests to fail.

Version 11.1

Release Date: 29 April 2023

Added support for Internationalized Domain Names (IDN).
Added support for primary zone's SOA record to have serial number date scheme.
Fixed issue reported by Xiang Li, Network and Information Security Lab, Tsinghua University that made the DNS server vulnerable to cache poisoning on Windows platform due to non-random UDP ports for outbound requests.
Fixed bug in validation check during refreshing RRSIG records when primary zone is signed with NSEC3.
Fixed bug in NSEC3 record's types field which caused missing of RRSIG type entry.
Fixed issue to allow Kestrel web server to serve unknown file types to allow certbot webroot HTTP challenge to work as expected.
Advanced Forwarding App: Fixed the implementation to correctly store cached records per client subnet defined in the app's config. Added wildcard domain support.
Multiple other minor bug fixes and improvements.

Version 11.0.3

Release Date: 11 March 2023

Fixed DoS vulnerability reported by Xiang Li, Network and Information Security Lab, Tsinghua University that an attacker can use to send bad-formatted UDP packet to cause the outbound requests to fail to resolve due to insufficient validation.
Fixed issue reported by Xiang Li, Network and Information Security Lab, Tsinghua University that caused conditional forwarder to not honoring RD flag in requests.
Fixed issue reported by Xiang Li, Network and Information Security Lab, Tsinghua University that made amplification attacks more effective due to max 4096 bytes limit for responses.
Fixed issue in loading of Allowed and Blocked zones that resulted in loading to take too much time caused due to indexing feature added in last update for authoritative zones.
Updated DNS server UDP response processing to remove glue records for MX responses and try again to send it instead of sending a truncated response that was causing issue with some old mail servers that did not perform follow up request over TCP.
Block Page App: Updated the app to support option to disable the web server without requiring to uninstall the app to stop the web server.
Multiple other minor bug fixes and improvements.

Version 11.0.2

Release Date: 26 February 2023

Fixed issue with DNS-over-HTTP private IP check that was causing 403 response when using with reverse proxy.
Fixed issue with zone record pagination caused when zone has no records.

Version 11.0.1

Release Date: 25 February 2023

Changed allow list implementation to handle them separately and show allow list count on Dashboard.
Fixed bug in conditional forwarder zone for root zone that caused the DNS server to return RCODE=ServerFailure.
Fixed issues with DNS server's App request query handling sequence to fix issues with Advanced Forwarding app.
Fixed issues with block list parser to detect in-line comments.
Fixed issue of "URI too long" in save DHCP scope action.
Updated Linux install script to use new install path in /opt and new config path /etc/dns for new installations.
Updated Docker container to use new volume path /etc/dns for config.
Updated Docker container to correctly handle container stop event to gracefully shutdown the DNS server.
Updated Docker container to include libmsquic to allow QUIC support.
Multiple other minor bug fixes and improvements.

Version 11.0

Release Date: 18 February 2023

Added support for DNS-over-QUIC (DoQ) RFC 9250. This allows you to run DoQ service as well as use it with Forwarders. DoQ implementation supports running over SOCKS5 proxy server that provides UDP transport.
Added support for Zone Transfer over QUIC (XFR-over-QUIC) RFC 9250.
Updated DNS-over-HTTPS protocol implementation to support HTTP/2 and HTTP/3. DNS-over-HTTP/3 can be forced by using h3 instead of https scheme for the URL.
Updated DNS server's web service backend to use Kestrel web server and thus the DNS server now requires ASP.NET Core Runtime to be installed. With this change, the web service now supports both HTTP/2 and HTTP/3 protocols. If you are using HTTP API, it is recommended to test your code/script with the new release.
Added support to save DNS cache data to disk on server shutdown and to reload it at startup.
Updated DNS server domain name blocking feature to support Extended DNS Errors to show report on the blocked domain name. With this support added, the DNS Client tab on the web panel will show blocking report for any blocked domain name.
Updated DNS server domain name blocking feature to support wildcard block lists file format and Adblock Plus file format.
Updated DNS server to detect when an upstream server blocks a domain name to reflect it in dashboard stats and query logs. It will now detect blocking signal from Quad9 and show Extended DNS Error for it.
Updated web panel Zones GUI to support pagination.
Advanced Blocking App: Updated DNS app to support wildcard block lists file format. Updated the app to disable CNAME cloaking when a domain name is allowed in config. Implemented Extended DNS Errors support to show blocked domain report.
Advanced Forwarding App: Added new DNS app to support bulk conditional forwarder.
DNS Block List App: Added new DNS app to allow running your own DNSBL or RBL block lists RFC 5782.
Added support for TFTP Server Address DHCP option (150).
Added support for Generic DHCP option to allow configuring option currently not supported by the DHCP server.
Removed support for non-standard DNS-over-HTTPS (JSON) protocol.
Removed Newtonsoft.Json dependency from the DNS server and all DNS apps.
Multiple other minor bug fixes and improvements.

Version 10.0.1

Release Date: 4 December 2022

Fixed multiple issues in EDNS Client Subnet (ECS) implementation.
Fixed issue with serialization when saving permission data when there are more than 255 zones.
Failover App: Fixed issue with idle connection for HTTP/HTTPS probes.
QueryLogs (Sqlite) App: Fixes issue of open db file on windows installations.
Multiple other minor bug fixes and improvements.

Version 10.0

Release Date: 26 November 2022

Added Dynamic Updates RFC 2136 security policy support to allow updates only for specified domain names and record types. This adds breaking changes to the zone options HTTP API calls. Any implementation that uses the zone options API must test with new update before deploying to production.
Added support for DANE TLSA RFC 6698 record type. This includes support for automatically generating the hash values using certificates in PEM format.
Added support for SSHFP RFC 4255 record type.
Implemented EDNS Client Subnet (ECS) RFC 7871 support for recursive resolution and forwarding.
Updated HTTP API to accept date time in ISO 8601 format for dashboard and query logs API calls. Any implementation that uses these API must test with new update before deploying to production.
Upgraded codebase to .NET 7 runtime. If you had manually installed the DNS Server or .NET 6 Runtime earlier then you must install .NET 7 Runtime manually before upgrading the DNS server.
Fixed self-CNAME vulnerability [CVE-2022-48256] reported by Xiang Li, Network and Information Security Lab, Tsinghua University which caused the DNS server to follow CNAME in loop causing the answer to contain couple of hundred records before the loop limit was hit.
Updated DNS Apps framework with IDnsPostProcessor interface to allow manipulating outbound responses by DNS apps.
NO DATA App: Added new app to allow returning NO DATA response in Conditional Forwarder zones to allow overriding existing records from the forwarder for specified record types.
DNS64 App: Added new app to support DNS64 function RFC 6147 for use by IPv6 only clients.
Advanced Blocking App: Upgraded the app code to use less memory when same block lists are used across multiple groups.
Geo Continent App, Geo Country App, and Geo Distance App: Upgraded the apps to support EDNS Client Subnet (ECS) RFC 7871.
Split Horizon App: Upgraded the app to add 1:1 IP address translation support. This allows mapping external/public IP address to internal/private IP address such that clients in private network can access local services using internal/private IP addresses.
Added support for Domain Search DHCP option RFC 3397
Added support for CAPWAP Access Controller DHCP option RFC 5417.
Added DHCP Scope option to disable DNS updates.
Added DHCP Scope option to support domain name for NTP option such that the DHCP server will automatically resolve the domain names and use the resolved IP addresses with the NTP option.
Multiple other minor bug fixes and improvements.

Version 9.1

Release Date: 9 October 2022

Added Dynamic Updates RFC 2136 support. This allows using tools like nsupdate, allow 3rd party DHCP servers to update DNS records, and use certbot certbot-dns-rfc2136 plugin for automatic TLS certificate renewal using DNS challenge.
Updated dashboard to display main chart using client's local time instead of server's local time.
Fixed bug that caused error while adding new secondary zone.
Multiple other minor bug fixes and improvements.

Version 9.0

Release Date: 24 September 2022

Added multi-user role based access support. This allows creating multiple users and multiple role based groups with permission based access controls.
Added support for non-expiring API tokens to use with automation scripts.
Added zone level permissions support to allow access only to selected users or group members.
User profile options available to update each user's session timeout values.
HTTP API: The API has been updated extensively keeping backward compatibility. Any implementation that uses the API must test with new update before deploying to production. Using the non-expiring API tokens is recommended.
Updated Conditional Forwarder zones to support APP records to allow using DNS Apps in these zones.
Option added in Settings to stop block list URL automatic update.
DNS Apps: There is a breaking change in the IDnsAppRecordRequestHandler.ProcessRequestAsync() method. If you have any custom DNS app deployed, you need to recompile it with the latest DnsServerCore.ApplicationCommon.dll before updating to this new release.
DNS Apps now support automatic updates. The DNS server will check for updates and install them automatically every 24 hours.
Split Horizon App: Added feature to configure collection of networks to use with APP record data.
Wild IP App: Added new DNS App that returns a response A or AAAA queries with the IP address that is embedded in the subdomain name of the query. This app works similar to sslip.io.
Fixed minor issues in DNSSEC validation for DNAME responses and for wildcard NO DATA responses.
DHCP scopes now support updating DNS records in both Primary and Forwarder zones.
DHCP scopes now support blocking dynamic allocations to devices with locally administered MAC address.
Multiple other minor bug fixes and improvements.

Version 8.1.4

Release Date: 3 July 2022

Fixed issue in recursive resolution that caused DNSSEC validation to fail in cases when the name server responds with out-of-bailiwick records.
Updated recursive resolver to update addresses async for all NS records to improve performance.
Multiple other minor bug fixes and improvements.

Version 8.1.3

Release Date: 11 June 2022

Added OpenDNS DoH end points to DNS Client and Forwarder quick select list.
Fixed issue of missing digest type support check that could cause exception to be thrown causing failure to resolve the DNSSEC signed domain name.

Version 8.1.2

Release Date: 28 May 2022

Fixed issue in Primary zone add and update record IXFR history when RRSet TTL was updated.
Fixed issue in DNSSEC validation for MX and SRV records caused due to incorrect comparison of record data.
Fixed issue in SOA record responsible person parameter parsing.
This release updates delete and update record API calls for MX and SRV records which may cause issues in 3rd party clients if they are not updated before deploying this new version. It is recommended to check the API documentation for changes before deploying this new release.
Multiple other minor bug fixes and improvements.

Version 8.1.1

Release Date: 21 May 2022

Added Sync Failed and Notify Failed zone status to indicate issues between primary and secondary zones synchronization.
Added more options in zone options to configure zone transfer and notify settings.
Fixed DNSSEC signed primary zone key rollover timing issues as per RFC 7583.
Fixed issue in recursive resolver by adding zone cut validation for glue records.
Multiple other minor bug fixes and improvements.

Version 8.1

Release Date: 8 May 2022

Fixed two ghost domain issues, CVE-2022-30257 (V1) and CVE-2022-30258 (V2), reported by Xiang Li, Network and Information Security Lab, Tsinghua University. Issue V1 was fixed with some implementation changes in the NS Revalidation feature and thus having this option enabled in Settings will mitigate the issue. Issue V2 was fixed by implementing additional validation checks when caching NS records.
Added maximum cache entires option to limit memory usage by removing least recently used data from cache.
Implemented NS revalidation to revalidate parent side NS records when their TTL expires.
Updated the web console to store session token in local storage to prevent logging out on page reload.
DropRequests App: Added support to block entire zone for the configured QNAME.
Fixed bug in primary zone IXFR history caused due to missing SOA serial check.
Fixed issues with wrong IXFR history entries for DNSKEY records in primary zone.
Multiple other minor bug fixes and improvements.

Version 8.0.2

Release Date: 3 April 2022

Fixed bug in Conditional Forwarder zones that would cause ServerFailure responses for some queries.
Fixed issue of setting minimum TTL value to NSEC & NSEC3 records in Primary signed zones when SOA value is changed.
Fixed issue in parsing DNS-over-HTTPS JSON response for NSEC and NSEC3 records.
Multiple other minor bug fixes and improvements.

Version 8.0.1

Release Date: 29 March 2022

Fixed bug in Conditional Forwarder zones due to zone cut validation causing negative cache entry for CNAME responses which resulted in partial responses.
Fixed issue with handling FormatError response that were missing question section for EDNS requests.
Fixed minor issue with DNSSEC validation for unsigned zone when forwarder returns empty NXDOMAIN responses.
Fixed issue with NODATA response handling for ANAME records.
Fixed issue with record comment validation causing error when saving SOA records in zones.
Multiple other minor bug fixes and improvements.

Version 8.0

Release Date: 26 March 2022

Added EDNS support RFC 6891.
Added Extended DNS Errors RFC 8914.
Added DNSSEC validation support with RSA & ECDSA algorithms for recursive resolver, forwarders, and conditional forwarders.
Added DNSSEC support for all supported DNS transport protocols including encrypted DNS protocols (DoT, DoH, DoH JSON).
Added DNSSEC zone signing support with RSA & ECDSA algorithms.
Updated DNS Client to support DNSSEC validation.
Updated proprietary FWD record which is used with Conditional Forwarder Zones for DNSSEC validation and HTTP/SOCKS5 proxy support.
Updated Conditional Forwarder Zones to support working as a static stub zone to force a domain name to resolve via given name servers using NS records.
Upgraded codebase to .NET 6 runtime.
Query Logs App: Added wildcard search support for domain names.
Fixed multiple issues with DHCP server.
This release updates many API calls which may cause issues in 3rd party clients if they are not updated before deploying this new version. It is recommended to check the API documentation for changes before deploying this new release.
Multiple other minor bug fixes and improvements.

Version 7.1

Release Date: 23 October 2021

Added option in settings to automatically configure a self signed certificate for DNS web service.
Fixed cache poisoning vulnerability [CVE-2021-43105] reported by Xiang Li, Network and Information Security Lab, Tsinghua University and Qifan Zhang, Data-driven Security and Privacy (DSP) Lab, University of California, Irvine when a conditional forwarder zone uses a forwarder controlled by an attacker or uses UDP/TCP forwarder protocol that the attacker can perform MiTM.
Block Page App: Added support for automatic self signed certificate to allow showing block page for HTTPS websites.
Drop Requests App: Added option to drop malformed DNS requests.
Query Logs App: Fixed minor issue which caused the query logs request to fail when a domain with invalid character was logged in the database.
Advanced Blocking App: Fixed bug in loading regex block list which caused the app to not block the domain names as expected.
Added logging in DNS server to know why a zone transfer request was refused by the server.
Added more environment variables for use with Docker to initialize the DNS server config. Read the environment variable documentation for complete details.
Multiple other minor bug fixes and improvements.

Version 7.0

Release Date: 2 October 2021

DNS Apps design updated to allow apps to act as authoritative zones, drop requests, and log queries in addition to the existing APP records in authoritative zones.
This release is a major update for DNS Apps design and thus any previously installed apps will fail to load after the update. A manual update is required to install the latest app update from the DNS App Store for these apps to work with this new release.
Advanced Blocking App: This new app allows blocking domain names based on IP address or subnet of the clients by creating groups. It also supports blocking using regex and also supports loading blocked domains from Adblock format lists.
Block Page App: This new app runs a built-in web server to allow serving a block page to clients when a domain name is blocked.
Drop Requests App: This new app allows dropping requests that match the blocked questions in the config allowing to block DNS amplification attacks that use specific domain name and query types.
NX Domain App: This new app allows blocking domain names with a NXDOMAIN response.
Query Logs (Sqlite): This new app allows logging all queries that the DNS server receives into a Sqlite database. The DNS server web panel adds an Query Logs option to allow querying the app for logged data.
Failover App: Implemented under maintenance feature to indicate if an address is taken down for maintenance.
Added Ping check option in DHCP scopes to allow detecting if an IP address is already in use before leasing it.
Added option to allow removing an allocated DHCP lease.
This release updates many API calls which may cause issues in 3rd party clients if they are not updated before deploying this new version. It is recommended to check the API documentation for changes before deploying this new release.
Multiple other minor bug fixes and improvements.

Version 6.4.1

Release Date: 21 August 2021

Implemented Delegation Revalidation draft-ietf-dnsop-ns-revalidation-01 in recursive resolver.
Fixed issues with DNS-over-TLS due to "dot" ALPN causing SSL handshake to fail when using NextDNS as forwarder.
Fixed issues in counting total unique clients in dashboard stats. The future data for total clients will be displayed correctly however the bad data since last release can be fixed by deleting '/etc/dns/config/stats/202108*.dstat' files manually.
Updated allowed list URL implementation to check for domains zone wise so that subdomain names from blocked list URLs too are allowed.
Updated DNS Failover App to v1.4 to fix implementation issues.
Multiple other minor bug fixes and improvements.

Version 6.4

Release Date: 14 August 2021

Added DNAME record RFC 6672 support.
Implemented incremental zone transfer (IXFR) RFC 1995 support.
Implemented secret key transaction authentication (TSIG) RFC 8945 support for zone transfers.
Implemented zone transfer over TLS (XFR-over-TLS) draft-ietf-dprive-xfr-over-tls support.
Added advance options in Settings to control TTL values in Cache.
Added Resync button to force resync Secondary and Stub zones.
Updated query rate limiting feature to allow limiting requests from the client's subnet.
Updated SplitHorizon App to support configuring CIDR networks.
Updated Failover App to fix multiple issues and added feature to auto generate health check URL from APP record domain name or specify the URL in the APP record data.
Fixed issues with log file rolling when using local time.
Multiple other minor bug fixes and improvements.
Updated few API calls which may cause issues in 3rd party clients if they are not updated before deploying this new version.

Version 6.3

Release Date: 6 June 2021

Added Failover App in DNS App Store.
Added comments option to DNS records in Zones.
Added Recursion ACL support to specify allowed and denied networks that can perform recursion.
Added Zone Options feature to allow configuring Zone Transfer and Notify settings per zone.
Added Queries Per Minute (QPM) Limit feature to limit the number of queries being made by an IP address.
Added feature to specify custom IP addresses for blocked domain names.
Added feature to temporarily/permanently disable blocking of domain names.
Added index page for DNS-over-HTTPS (DoH) web service that displays basic configuration information to user when DoH URL is visited using a web browser.
Fixed multiple issues in QNAME minimization implementation.
Fixed multiple DNS Client implementation issues.
Multiple other minor bug fixes and improvements.
Updated few API calls which may cause issues in 3rd party clients if they are not updated before deploying this new version.

Version 6.2.3

Release Date: 2 May 2021

Improved DNS Apps interface to show if updates are available in the installed apps list.
Updated stats module to truncate daily stats data to optimize memory usage.
Fixed issue with QNAME minimization caused due to missing check when response contained no answer and no authority.
Fixed issue in logger which would fail to start in certain conditions.
Updated DNS Apps to shuffle addresses in response to allow load balancing.

Version 6.2.2

Release Date: 24 April 2021

Fixed issues with recursive resolution.
Fixed issue in parsing AXFR response.
Fixed missing tags in responses to reflect correct stats on dashboard.
Fixed issue with web console redirection on saving settings when using a reverse proxy.
Multiple other minor bug fixes and improvements.

Version 6.2.1

Release Date: 17 April 2021

Updated DNS Cache serve stale implementation for better performance.
Implemented CNAME resolution optimization in DNS Cache and Auth Zone.
Fixed issue in DNS Cache caused due to missing check of the type of NS record's RDATA causing cache zone to return special cache RDATA record.
Fixed issue in DNS client caused when response greater than the buffer size is received.

Version 6.2

Release Date: 11 April 2021

Fixed critical bug in block list condition check causing server to respond with RCODE=Refused when only using Blocked zone.
Added option to respond with RCODE=NxDomain for blocked domains instead of returning 0.0.0.0 address.
Renamed NameError to NxDomain to make the terminology clear that the domain does not exists. Dashboard API returns JSON with new terminology so its advised to test your code before updating the server.

Version 6.1

Release Date: 10 April 2021

Added DNS App Store feature that list all available apps for quick and easy installation and update.
Added 'Overwrite' option in Add Record for zones.
Multiple ANAME record support added.
Added block list allowed URL feature to prevent domain names from getting added to the block list zone.
Fixed bug in ZoneTree.
Fixed bugs in DNS Apps.
Split Default DNS App into 5 independent apps that are now available on the DNS App Store.
Fixed issues in DNS Cache and updated code for memory optimization.
Upgraded all library projects to .NET 5.
Multiple other minor bug fixes and improvements.

Version 6.0

Release Date: 13 March 2021

Updated entire DNS code base to .NET 5 with new Windows installer. This upgrade will improve overall performance on Windows installations.
Added support for DNS Application (APP) propriety record with DNS Apps feature support. DNS Apps allows creating custom apps by 3rd party using .NET that run on the DNS server allowing the apps to process DNS requests and provide custom DNS response based on any bussiness logic.
A default DNS app (available to download separately) supports APP records capable of Split Horizon and Geolocation based responses using MaxMind's GeoIP2 City & Country databases.
Updated dashboard charts to save legend selection state.
Updated dashboard with Custom date selection option to display stats.
Added option to configure max stats days in settings.
Added option to enable/disable QNAME minimization.
Added delete existing files option in Restore settings.
Added support to store query stats data to allow DNS cache auto prefetch to refresh cache when DNS server restarts.
Updated TLS certificate implementation to allow using self signed certificates for web console, DoH, and DoT.
Added DHCP lease Reserve/Unreserve options to allow quickly reserving lease for clients.
Updated DHCP reserved lease option to allow overriding client's host name.
Fixed issues with DNS cache auto prefetch feature.
Fixed multiple issues in DNS cache.
Fixed multiple vulnerabilities causing DNS cache poisoning.
Multiple other minor bug fixes and improvements.

Version 5.6

Release Date: 2 January 2021

Updated standalone console app to work on .NET 5 and removing standalone .NET Framework app support. .NET 5 update will boost performance of the DNS server on all platforms.
Updated DNS and DHCP listener code to use async IO to improve performance.
Added HTTPS support for web service that provides the web console access.
Added support to change the web service local addresses.
Updated the server to allow changing DNS server end points, the web service end points, or enabling DoH or DoT services instantly without need to manually restart the main service. Basically, you do not need to restart the DNS server app at all for applying any kind of settings as all the changes are applied dynamically.
Added HTTP compression support in the main web service.
Added HTTP compression for downloading block lists.
Added option to clear and delete all dashboard stats and auto clean up old stats files from disk
Added option to delete all log files and auto clean up old log files from disk.
Added configurable option to disable logging, allow logging in local time, and to change log folder path.
Added option in settings to define the refresh interval for block lists with a manual option to force refresh all block lists.
Added support for exporting backup zip file containing selected items like config files, logs, stats, etc. and allow restoring the backup zip file without restarting the main service.
Fixed multiple issues in DHCP server's DNS record management.
Fixed bug in DNS server cache prefetching for stub and conditional forwarder zones causing the cached data to be overwritten by the prefetched output from recursive resolution.
Fixed html encoding issue in web app.
Added option in web app to list top 1000 clients, top domains and top blocked domains.
DNS cache serve stale feature made configurable with default serve stale TTL set to 3 days instead of 7 days.
Fixed issue in recursive resolver to avoid querying root servers when one of the parent zone's name servers exists in DNS cache.
Breaking changes in the getDnsSettings and setDnsSettings API calls will require API clients to update the code before updating the DNS server.
Multiple other minor bug fixes and improvements.

Version 5.5

Release Date: 14 November 2020

Added option to specify bootfile name for PXE booting.
Implemented DHCP vendor specific information option.
Implemented strict enforcing of exclusion list.
Fixed bug in DNS initial server name that was caused due to invalid characters in the computer name.
Added support for additional record processing for SRV records and fixed issues for NS and MX records processing.
Multiple other minor bug fixes and improvements.

Version 5.4

Release Date: 18 October 2020

Implemented QNAME randomization feature draft-vixie-dnsext-dns0x20.
Fixed bug causing infinite loop in certain conditions when using UDP as transport.
Fixed bug in DNS cache querying which caused the server to make unneeded queries when performing recursive resolution.
Added Create PTR Zone option when adding A or AAAA records.
Fixed issues with DHCP scope selection when using relay agent.
Implemented changes to allow changing DHCP scope IP allocation from dynamic to reserved and vice versa.
Updated DHCP scope to allow specifying Next Server Address for use with TFTP for booting.
Multiple other minor bug fixes and improvements.

Version 5.3

Release Date: 26 September 2020

Fixed issues with DHCP server that caused it to not work correctly with relay agents.
Updated DHCP server to support multiple scopes to work on a single network interface allowing it to provide different options for groups of devices.
Multiple other minor bug fixes and improvements.

Version 5.2

Release Date: 6 September 2020

Added feature to allow using certbot to renew TLS certificates automatically when using DNS-over-HTTPS and DNS-over-TLS.
Fixed issue in DHCP server that caused thread to block by implementing async methods.
Fixed bug in DNS client that caused QTYPE mismatch due to QNAME minimization.
Fixed issues in DNS-over-HTTPS client related to retries and http error handling.
Multiple other minor bug fixes and improvements.

Version 5.1

Release Date: 29 August 2020

Implemented async IO to allow the DNS server handle much higher concurrent loads.
Implemented independent thread pools for DNS web service and recursive resolver.
Fixed bug in block list downloader that caused 0 byte file downloads.
Fixed bug in DHCP server in creating reverse zone.
Multiple other minor bug fixes and improvements.

Version 5.0.2

Release Date: 18 July 2020

Fixed issue of missing port for "This Server" in DNS Client.
Added domain name that was blocked in the TXT record.
Fixed bugs in CNAME cloaking implementation.
Upgraded .NET Framework version to v4.8.
Multiple other minor bug fixes and improvements.

Version 5.0.1

Release Date: 6 July 2020

Fixed serialization bug for TXT records.
Fixed issue with reading DnsDatagram for DoH POST requests.
Fixed bug in json serialization of DnsDatagram for DoH json format.
Fixed bug in RTT calculation for DoH json Connection.

Version 5.0

Release Date: 4 July 2020

DNS Server local end points support to allow specifying alternate ports for UDP and TCP protocols.
DNS Server performance issues caused by thread contention fixed.
CNAME cloaking implemented to block domain names that resolve to CNAME which are blocked.
New Block List zone implementation that uses very less memory allowing to load block lists with millions of domain names even on a Raspberry Pi with 1GB RAM.
QNAME minimization support in recursive resolver draft-ietf-dnsop-rfc7816bis-04.
ANAME propriety record support to allow using CNAME like feature at zone root.
Added primary zones with NOTIFY implementation RFC 1996.
Added secondary zones with NOTIFY implementation RFC 1996.
Added stub zones with feature to override records.
Added conditional forwarder zones with all protocols including DNS-over-HTTPS and DNS-over-TLS support.
Conditional forwarder zones with feature to override records.
Conditional forwarder zones with support for multiple forwarders with different sub domain names.
ByteTree based zone tree implementation which is a complete lock-less and thread safe tree allowing concurrent read and write operations.
Fixed bug in parsing large TXT records.
DNS Client with internal support for concurrent querying. This allows querying multiple forwarders simultaneously to return fastest response of all.
DNS Client with support to import records via zone transfer.
Multiple other bug fixes in DNS and DHCP modules.

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