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I run a DC++ server (PtokaX) with peak users around 1500. From time to time, the server goes in a state where any new socket connection to PtokaX stays at SYN_RECV and few sockets at CLOSE_WAIT. I am sure the problem is application specific since ssh responds normally. Also my network connection at that time is perfectly stable as well (checked with ping).

I am sure it is not a SYN flood since the sockets in SYN_RECV state are from all different ips. Also my own connection stays in that state. I am using Debian 6.0.3 linux 2.6.32-5 i686.

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Peer-to-Peer file sharing is not on-topic for ServerFault. And a particular application's behavior with no logging or other debug output is too localized for us to give you much in the way of assistance. –  Magellan Nov 18 '12 at 20:39
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closed as off topic by Tom O'Connor, Magellan, Iain Nov 18 '12 at 21:42

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