When I came into work today, our (Debian Woody) mail server wasn't responding (my previous SSH connection was 'hung' and IMAP/POP connections wouldn't work and pings were not responsive, either) and I went to the console and plugged in a monitor and it was a black screen (hitting the space bar or enter key didn't do anything).

So I had to hit the server's reset key (ugh) ... about 15 minutes later after the auto fsck, everything looks ok.

This is a publicly available server, so my main concern is that someone has r00ted me. I have been keeping up to date on security patches that Debian puts out.

I waded through logs (nothing suspicious, though there were several attempts to do one of those "/SEARCH [long uri]" in its apache access.log -- it was one of the last entries). In /var/log/messages, I get a MARK every 20 minutes ... there's a big gap between the last mark at 3:56am and when I restarted the server at 8:46. In the mail.log file, the gap starts at 4:08, so that's when I think something happened (I have a co-worker that POP's his mail every minute ;)).

I also ran a 'chkrootkit', but that didn't turn anything up.

I did a netstat -atu and there are a couple of entries there that I don't know about:
tcp 0 0 *:32768 *:* LISTEN
udp 0 0 *:821 *:*
udp 0 0 *:1111 *:*


Is there any way to see what process is tied to those ports?

Can anyone point me in a direction to figure out what happened? Random hardware glitch or something else?

Thanks,

Jason
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