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kasperd was right about strace not showing all threads of the process (somehow I was sure that attaching to process will monitor all threads). So auditd confirmed it is my application closing the socket (because some misterious "signal 33" happens and recv() doesn't handle EINTR properly. I will ask another question about this).


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Something triggers the closing of the connection on the server side. Most likely it is the application on the remote server that shuts down the connection. Possible reasons are idle disconnection feature on the server, software bugs etc. If the remote server is behind NAT, it could also be caused by expiration of the NAT entry in the device doing the NAT. ...



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