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Scenario is : We have a server machine behind a DSL router to which multiple clients are connecting over internet. For few days it worked fine but from today we have observed frequent disconnection. On checking with tcpdump we came to know that server is sending RST. Observed a pattern : Just before server initiates RST its receiving [ACK] and [PSH,ACK] with same sequence number. What can be the cause for this ?

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Are you running tcpdump on the server or the client? –  joeqwerty Sep 7 '11 at 3:50
    
Yeah, when you say "server initiates RST", do you mean you are watching what the server is sending to the router? Or do you mean you are watching what the router sends the client? And is the router doing NAT? –  David Schwartz Sep 7 '11 at 3:51
    
Yes router is doing NAT. I took tcpdump at server side here is the screen shot for same. i.stack.imgur.com/oYBWS.jpg –  Sunil Sep 7 '11 at 3:54
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