We are running a LAMP server using ubuntu 10.04. The server is mainly an email server plus it renders a few websites. A while ago the server began having connectivity issues. Intermittently, and usually lasting for only a few minutes, the server will lose all external connectivity. All the linode graphs will go to zero during the lost connectivity time and there is nothing remarkable on any of the graphs before the connectivity loss. We can access the server during this time via the Ajax console. Usually, by the time we investigate the issue it has resolved itself so debugging this has been challenging. To eliminate hardware possibilities we asked Linode to move the server to different hardware but that too did not help.
So just wondering if anyone else has seen this and if so what was the cause and resolution.
