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Debugging netsh portproxy tls client hello tcp connection reset

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On a Windows 2016 Server (1607) we're currently facing quite strange TCP Connection Reset issues on TLS1.2 Client Hello on a port with port-proxy (netsh interface portproxy add v4tov4 ...); sometimes the Client Hello leads to an Connection Reset error, some times the connection is properly established.

Screenshots (links due to reputation) below;

the connection is coming from 10.86.81.0/24, accessing 196.168.112.38:7447 (port-proxy), which is forwarded to 172.16.13.70:443.

OK Connection

Connection Reset

Is there a way to further debug what is happening here?

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