We have a problem in SLES11SP3.
Our server runs normaly. But sometimes we have a network error. The server can connect to every server and client in our network except for one other SLES server. Thats not always the same server. The traceroute from the other server to our server goes normaly until our gateway. Our server didn't answert. A traceroute from our server to the other server, brakes direct on our server. A traceroute to every other server is normal, no problem.
This problem occurs every 4-6 weeks.
The firewall on server is disabled. AppAmor on server is disabled. The logs shows no error or warnings for this problem.
After a restart of the server, everything is normal.

Who can help us?!