akkadotnet/akka.net 1.5.56

akka.net v1.5.56

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1.5.56 November 25th, 2025

Akka.NET v1.5.56 is a patch release containing important bug fixes for Akka.Remote and Akka.Streams.

Bug Fixes:

• Fix: Akka.Remote should not shutdown on invalid TLS traffic - Fixes issue #7938 where invalid traffic (like HTTP requests) hitting a TLS-enabled Akka.Remote port would cause the entire ActorSystem to shut down. Server now rejects invalid connections gracefully without terminating.

• fix(streams): prevent race condition in ChannelSource on channel completion - Fixes issue #7940 where a NullReferenceException could occur when completing a ChannelWriter while the stream is waiting for data. Added atomic flag to prevent race condition between OnReaderComplete and OnValueRead callbacks.

1 contributor since release 1.5.55

To see the full set of changes in Akka.NET v1.5.56, click here

1.5.55 October 26th, 2025

Akka.NET v1.5.55 is a patch release containing important stability and security improvements for Akka.Remote.

Akka.Remote Stability Improvements:

• Akka.Remote: harden EndpointWriter against serialization failures - Fixes issue #7922 by hardening the EndpointWriter against a broader range of potential serialization failures, improving overall remoting stability.

Akka.Remote Security Improvements:

• Custom certificate validation with single execution path - fixes mTLS asymmetry bug - Fixes issue #7914 by introducing programmatic certificate validation helpers through the new CertificateValidation factory class. This release adds 7 new validation helper methods including ValidateChain(), ValidateHostname(), PinnedCertificate(), ValidateSubject(), ValidateIssuer(), Combine(), and ChainPlusThen(). The update also fixes an mTLS asymmetry bug where server-side hostname validation was not being applied consistently with client-side validation, all while maintaining full backward compatibility with existing HOCON-based validation.

• Fix DotNettySslSetup being ignored when HOCON has valid SSL config - Fixes issue #7917 where programmatic DotNettySslSetup settings were incorrectly being overridden by HOCON configuration. Programmatic configuration now correctly takes precedence over HOCON defaults as intended.

1 contributor since release 1.5.54

To see the full set of changes in Akka.NET v1.5.55, click here

1.5.54 October 17th, 2025

Akka.NET v1.5.54 is a patch release containing important bug fixes for Akka.Streams and Akka.DistributedData.

Bug Fixes:

• Fix SourceRef.Source and SinkRef.Sink non-idempotent property bug - Fixes issue #7895 where ISourceRef<T>.Source and ISinkRef<T>.Sink properties created new stage instances on every access, causing race conditions and intermittent subscription timeouts. These properties are now idempotent using Lazy<T>, preventing failures from accidental property access (debugger inspection, logging, serialization frameworks).

• Fix LWWDictionary.Delta ArgumentNullException when underlying delta is null - Fixes issue #7910 where LWWDictionary.Delta would throw ArgumentNullException when the underlying ORDictionary.Delta was null, which is a legitimate state after initialization or calling ResetDelta().

1 contributor since release 1.5.53

To see the full set of changes in Akka.NET v1.5.54, click here

1.5.53 October 9th, 2025

Akka.NET v1.5.53 is a security patch containing important fixes for TLS/SSL hostname validation and improved error diagnostics for certificate authentication issues.

Security Fixes:

• Fix TLS hostname validation bug and add configurable validation - Fixes a critical bug where TLS clients validated against their own certificate DNS name instead of the remote server address, particularly affecting mutual TLS scenarios. This release also adds a new validate-certificate-hostname configuration option to akka.remote.dot-netty.tcp (defaults to false for backward compatibility) and introduces type-safe validation APIs through the new TlsValidationCallbacks factory class.

Improvements:

• Improve TLS/SSL certificate error messages during handshake failures - Provides human-readable, actionable error messages for TLS/SSL certificate validation failures with detailed troubleshooting guidance, significantly improving the developer experience when configuring certificate-based authentication.

1 contributor since release 1.5.52

To see the full set of changes in Akka.NET v1.5.53, click here

1.5.52 October 6th, 2025

SECURITY PATCH

Akka.NET v1.5.52 is a security patch containing crucial fixes for enforcing certificate-based authentication using mTLS enforcement. Please see https://getakka.net/articles/remoting/security.html for details on how this works.

• Akka.Remote: implement mutual TLS authentication support
• Akka.Remote: validate SSL certificate private key access at server startup

Other fixes:

• Akka.Cluster.Sharding: ShardedDaemonSets: randomize starting worker index

1 contributors since release 1.5.51

To see the full set of changes in Akka.NET v1.5.52, click here

1.5.51 October 1st, 2025

Akka.NET v1.5.51 is a minor patch containing a remoting bug fix and add required codes to support persistence health check.

• Remote: Fix DotNetty TLS handshake error handling
• Persistence: Add health check handling code

2 contributors since release 1.5.50

To see the full set of changes in Akka.NET v1.5.51, click here

1.5.50 September 22nd, 2025

Akka.NET v1.5.50 is a minor patch containing a bug fix.

• Remote: Propagate error from DotNetty TLS Handshake failure to Akka.Remote

1 contributor since release 1.5.49

To see the full set of changes in Akka.NET v1.5.50, click here

1.5.49 September 10th, 2025

Akka.NET v1.5.49 is a minor patch containing several bug fixes.

• Core: Fix IIS/Windows Service console race condition
• DData: Fix Replicator.ReceiveUnsubscribe boolean logic
• Streams: Fix ConcurrentAsyncCallback with ChannelSource throws NRE

3 contributors since release 1.5.48

To see the full set of changes in Akka.NET v1.5.49, click here

1.5.48 August 21st, 2025

Akka.NET v1.5.48 is a minor patch containing stability improvement to Akka.TestKit.

• TestKit: Fix deadlock during parallel test execution

2 contributors since release 1.5.47

To see the full set of changes in Akka.NET v1.5.48, click here

1.5.47 August 12th, 2025

Akka.NET v1.5.47 is a minor patch containing several stability improvements to Akka.TestKit.

• TestKit: Replace Thread.Sleep with SpinWait
• TestKit: Fix excessive AggregateException nesting when cancelling ExpectMessageAsync
• TestKit: Add async overload to multi-node TestConductor API
• Core: Move ByteBuffer alias to global using

4 contributors since release 1.5.46

To see the full set of changes in Akka.NET v1.5.47, click here

1.5.46 July 17th, 2025

Akka.NET v1.5.46 is a minor patch containing a fix for the Akka.IO.Dns extension.

• Core: Resolve ManagerClass type from IDnsProvider

3 contributors since release 1.5.45

To see the full set of changes in Akka.NET v1.5.46, click here

1.5.45 July 7th, 2025

Akka.NET v1.5.45 is a minor patch containing bug fixes for Core Akka and Akka.Cluster.Sharding plugin.

• Core: Code modernization, use deconstructor for variable swapping
• Sharding: Fix unclean ShardingConsumerControllerImpl shutdown
• Core: Convert Failure to Exception for Ask<object>
• Core: Fix Settings.InjectTopLevelFallback race condition
• Sharding: Make remembered entities honor supervision strategy decisions

Supervision Strategy For Sharding Remembered Entities

• We've added a SupervisorStrategy property to ClusterShardingSettings. You can use any type of SupervisionStrategy, but it is recommended that you inherit ShardSupervisionStrategy if you're making your own custom supervision strategy.
• Remembered shard entities will now honor SupervisionStrategy decisions and stops remembered entities if the SupervisionStrategy.Decider returned a Directive.Stop or if there is a maximum restart retry limitation.

4 contributors since release 1.5.44

To see the full set of changes in Akka.NET v1.5.45, click here

1.5.44 June 19th, 2025

Akka.NET v1.5.44 is a minor patch that contains a bug fix to the Akka.Persistence plugin.

• Persistence: Make sure that EventSourced timer is canceled when persistent actor is stopped

3 contributors since release 1.5.43

To see the full set of changes in Akka.NET v1.5.44, click here.

1.5.43 June 10th, 2025

Akka.NET v1.5.43 contains several bug fixes and also adds new quality of life features.

• Cluster.Tools: Fix PublishWithAck response message type
• Sharding: Allows sharding delivery consumer to passivate self
• TestKit: Fix CallingThreadDispatcher async context switching
• Persistence.Query: Add non-generic ReadJournalFor API method
• Core: Simplify null checks
• Core: Propagate CoordinatedShutdown reason to application exit code
• Core: Bump AkkaAnalyzerVersion to 0.3.3
• Core: Improve IScheduledTellMsg DeadLetter log message

New Akka.Analyzer Rules

We've added three new Akka.Analyzer rules, AK2003, AK2004, and AK2005. All of them addresses the same Akka anti-pattern where a void async delegate is being passed into the ReceiveActor.Receive<T>() (AK2003), IDslActor.Receive<T>() (AK2004), and ReceivePersistentActor.Command<T>() (AK2005) message handlers.

Here are the documentation for each new rules:

• AK2003 documentation
• AK2004 documentation
• AK2005 documentation

4 contributors since release 1.5.42

To see the full set of changes in Akka.NET v1.5.43, click here.

Changes:

• dae0a40 Prepare v1.5.56 release (#7953)
• 9601f62 Fix: Akka.Remote should not shutdown on invalid TLS traffic (#7939) (#7952) [ #7839, #7938 ]
• 70695d9 fix(streams): prevent race condition in ChannelSource on channel completion (#7941) (#7951) [ #7940 ]

This list of changes was auto generated.