Hi, i am facing a similar Problem since iOS 15. In my case, it is a JavaScript client trying to communicate with Wowza Streaming Engine. The connection fails as soon the client tries to send some data.
Disabling "NSURLSession WebSocket" resolves the issue.
While my project is not available to the public, I found a page (which I am not related to), where the issue can be reproduced
https://libwebsockets.org/testserver/ (click on the "send junk" button)
DirtyHerri
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