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I have a desktop application which talks to a server using TCP/IP. It was working before but now we are running into an issue. The log message on the server shows that the socket is disconnected after a while, but we are able to exchange heartbeat messages. When I ran the Wireshark tool I get this log which I don't know how to interpret:

4324    36.613058   
    TCP 843 > bvcontrol [RST, ACK] Seq=1 Ack=1 Win=0 Len=0

6312    61.546839   
    TCP 843 > nmsd [RST, ACK] Seq=1 Ack=1 Win=0 Len=0

The other thing is when I run this application in the LAN where the server is running it just works fine.

Please help me to understand what is happening in the network.

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There's not enough information here to understand what's really happenning, but you might want to have a look for a stateful firewall between and Also check if you've got keepalives enabled on the client.

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