I have 2 Debian Linux 6.0.4 servers that have a strange behaviour: after 5-7-10 days they hang. By this I mean the servers need to be restarted and before that ping won't answer.

I've been struggling with this problem for a couple of months now and here's some thoughts/what I tried without being able to solve the problem.

• I changed the RAM on a server. Being 2 different servers I doubt that it could be something related to hardware as a 3rd identical server won't have this problem.
• I logged the server load and when it crashes the load is fine (quite low)
• I cannot find anything in the server logs, logs are fine till the server freezes.
• I don't have access to console unfortunately.

While I have years of admin experience I have never encountered such an issue and right now I have no idea where else to investigate.

If you have an idea of what I could try in order to fix the problem please share it with me:-)