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Was sagt ​CloseStatus? Der WebSockets ist nicht Threadsafe, rufst du vielleicht mehrere SendReceive gleichzeitig auf und wartest nicht auf den voherigen?

Apparently, I was hitting an HTTP.SYS low speed connection attack countermeasure, as roughly described in KB 3137046 (https://support.microsoft.com/en-us/help/3137046/http-sys-forcibly-disconnects-http-bindings-for-wcf-self-hosted-servic): By default, Http.sys considers any speed rate of less than 150 bytes per second as a potential low speed connection attack, and it drops the TCP connection to release the resource. When HTTP.SYS does that, there is a trace entry in the log at %windir%\System32…