I own Dedicated server amd athlon 2800+ with directadmin and my site gets average 20 - 30 user per 15 minutes .. i.e. aroung 60GB per month bandwidth .. the bandwidth usage has been going correct from the past 3 months. This month from april 1st to april 6th .. the bandwidth usage reported 500GB which is i think is impossible for my site. I have to no idea which could have caused ddos or apache error ? How do i proceed ? i have seen apache access and error logs .. but i dont find any suspicious activity. Directamin says site has received more hits than previous month in just 5 days
Either someone is sending a ton of traffic to you, or your server is sending a ton of traffic out. Quickiest way if you aren't familiar with linux is to ask your datacenter for a bandwidth graph. If it's all incoming BW have them look into your traffic for a possible DDOS attack. It is probably more likely someone is exploiting something on your server to setup a FTP/BNC/whatever server and piggyback on your bandwidth.
I just saw this issue being put up at directadmin forums. Here's the link : http://directadmin.com/forum/showthread.php?t=18077
Someone is most likely attacking your server, it happened to me some time ago. Talk to support and get them to trace the traffic and block the IP where its coming from. That should take care of it. Then find the domain the traffic is coming from and report that domain to the host so that account will be banned.
Thanks for that link I guess its Directadmin problem. I havent updated my Directadmin .. will try that.