DDOS attack coming from my server?

I just received an email today from my server provider that there are DDOS attacks coming from my server. All I have on my server are my personal websites, and i'm the only user.

How could this happen? all I have on my server is Joomla and SMF forum applications. How can I trace it?

Btw, my server is from DedicatedNow.

TIA.

 

 

 

 

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