How to check if some one is spamming from my server (Linux Plesk 8.x)

Tuesday, November 13th, 2007

If you see a lot of smtp connections or your server gets constantly in spam black lists, maybe you should check if some bot spams through your server.

The are 2 cases of spamming through a box:

1)using unsecure php forms that bots abuse
2)using smtp connection from an outside client

this artice is about the 2nd case,

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Posted in Mail Server, Security, Unix/Linux Various | No Comments »

Checking if a server is under ddos attack

Monday, June 4th, 2007

A quick and usefull command for checking if a server is under ddos is:

netstat -anp |grep ‘tcp\|udp’ | awk ‘{print $5}’ | cut -d: -f1 | sort | uniq -c | sort -n

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Posted in Network, Security, Unix/Linux Various | No Comments »