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DDOS port 53 problem

wprescott

New Pleskian
Received notification that our server is taking part in an attack. Their logs shows:

IP x.x.x.x.53 > y.y.y.y.25448: 7490 Refused- 0/0/1 (36)

x.x.x.x is our Ip and y.y.y.y is the remote machine

I have followed lots of links and advice. I have turned off DNS recursion etc.

Plesk 11 Windows 2008 anybody come across this problem and solved?

Help appreciated.
 
What kind of attack they are talking about? Do they have a request content from your DNS server?
 
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