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Old 8th November 2012, 17:52
pititis pititis is offline
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The easy way is checking your firewall in ispconfig(system->firewall) and be sure that port 53 tcp and udp are open in both servers. is ok.

Are you behind a cable/adsl router?

Wait 5 minutes after this change and post the output from:

netstat -tulpena

iptables -L INPUT -n
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