Beware: potential issue with latest Windows cumulative update KB5066835

[jchristn]

Noticed with another one of my projects WatsonWebsocket

There seems to be an issue with the latest cumulative update from Microsoft on Windows 10/11 which affects HttpListener: https://learn.microsoft.com/en-us/answers/questions/5585440/kb5066835-update-causing-iis-service-to-not-work

Additional context: https://stackoverflow.com/questions/79790827/localhost-applications-failing-after-installing-2025-10-cumulative-update-for-w

[jchristn]

Additional context: jchristn/WatsonWebsocket#161

[Taiizor]

@jchristn Is the same situation valid for Watson.Lite as well? Because Watson.Lite uses TcpListener, whereas Watson uses HttpListener.

[jchristn]

Hi, I would assume it does not affect Watson.Lite.