We are a some devs working on a Debian server. We are all connecting from one IP.

So basically the server handles a lot of requests from the same IP. Now what happens from time to time, is that we get a timeout. It feels like fail2ban, if you input the wrong password for several times. But it's not.

There is no firewall restriction on ports or sockets.

Could it be some kind of kernel maximum to TCP/IP connections? top says that there is no strain at all. (cpu, ram etc...).

The web-server is an AOLServer. There are definitely no issues with it.

Version: 6.0.7 Debian

The same goes for SSH as you can see it's not application related but rather OS related.

We all use Debian as clients as well. If people connect from a windows machine there aren't problems.

Thankful for all suggestions. Let me know if you need more information.

  • look maybe at ulimit, there are now inside the kernel some limitation to avoid denial of service that can be activated I know I add a similar issue on a xfce ubuntu but it really depends of the kernel and the ulimit – Kiwy Apr 2 '14 at 7:48
  • good point, I will check on that. – iliketurtles Apr 2 '14 at 7:49
  • What does a wireshark or tcpdump network trace look like from both ends when the problem occurs? – Matt Apr 2 '14 at 8:22
  • @mindthemonkey I'll test that and report afterwards. thanks for suggestion. – iliketurtles Apr 2 '14 at 8:41
  • I couldn't reproduce the error anymore... But I'm sure it will come back again. Meanwhile I'll try to find the problem in networking with tcpdump. – iliketurtles Apr 8 '14 at 12:58

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