CSF blocking connections to open port UDP 53

[SpinDreams]

I recently moved the IP of one of our DNS servers to a new cpanel server after checking DNS was running correctly on the server. However since moving the IP and adding it to the new server we are getting lots of LFd temp blocks for servers connection to DNS (example below)

Port 53 is in the list of open UDP ports in CSF so i'm at a loss to understand what the problem is. Anyone got any ideas.

Code: Select all

Subj:lfd on myurl: 199.7.83.42 blocked for port scanning
Time:    Wed Jun  5 13:45:43 2013 +0000
IP:      199.7.83.42 
Hits:    11
Blocked: Temporary Block

Sample of block hits:
Jun  5 13:44:12 tesla kernel: Firewall: *UDP_IN Blocked* IN=eth0 OUT= MAC=02:01:00:01:15:70:50:57:a8:4c:3d:3f:08:00 SRC=199.7.83.42 DST=213.229.xx.xx LEN=524 TOS=0x00 PREC=0x00 TTL=60 ID=16006 PROTO=UDP SPT=53 DPT=39526 LEN=504 

[chatwizrd]

csf -r