akkadotnet/akka.net 1.5.68

akka.net v1.5.68

on GitHub

1.5.68 May 17th, 2026

Akka.NET v1.5.68 is a maintenance release with bug fixes for Akka.IO TCP connection handling, Akka.Streams stream materialized task faults, and Akka.TestKit xUnit 3 parallel context management.

Akka.IO Bug Fixes

• Fix: report Tcp.CommandFailed when a scheduled connect retry throws - Fixes #8195: On Linux, a dropped TCP connection could permanently stall the user actor — it never received Tcp.Connected or Tcp.CommandFailed because a PlatformNotSupportedException thrown during a scheduled connect retry was swallowed by the HashedWheelTimerScheduler. The retry is now scheduled as a RetryConnect self-message via IWithTimers, ensuring any exception is surfaced to the commander as Tcp.CommandFailed and the connection actor stops cleanly. The pending timer is also canceled automatically when the actor stops, removing a latent use-after-dispose bug.

Akka.Streams Bug Fixes

• Fix: observe discarded stream task faults - Fixes #8209 and #8210: IgnoreSink, QueueSource, and LazySink now observe their internal materialized Task faults, preventing them from surfacing later as UnobservedTaskException events on the thread pool.

Akka.TestKit Bug Fixes

• Fix: wrap outer SynchronizationContext in ActorCellKeepingSynchronizationContext - ActorCellKeepingSynchronizationContext now accepts an optional inner SynchronizationContext and delegates scheduling to it while wrapping callbacks with the cell-pinning window. This prevents test hangs in downstream consumers such as Akka.Hosting.TestKit whose async IHost lifecycle depends on xUnit v3's MaxConcurrencySyncContext scheduling.

1 contributor since release 1.5.67

To see the full set of changes in Akka.NET v1.5.68, click here.

Changes:

• 9a00eff Update RELEASE_NOTES.md for 1.5.68 release (#8216)
• e5afb74 fix: report Tcp.CommandFailed when a scheduled connect retry throws (#8195) (#8214)
• 2ab48f5 fix: observe discarded stream task faults (#8212)
• e608054 fix: wrap outer SynchronizationContext in ActorCellKeepingSynchronizationContext (#8182) [ akkadotnet/Akka.Hosting#735, akkadotnet/Akka.Hosting#733 ]

This list of changes was auto generated.