Just had an odd problem on our network with regard to DNS
Issue: could not resolve IP address for a few websites including experts-exchange messagelabs.com and a few others.
On the DNS server: no forwaders are being used - only root hints
ran nslookup but it just timed out - other websites worked fine
Setup a forwader using our ISP address and all sites began resolving again.
I have now removed the forwarder cleared cache again and everything is resolving fine..... really weired .
I also checked our firewall and Our rules specify DNS server --------outgoing -----------allow port 53 to ---------any
I also checked all root hints are up to date and server log errors (all fine)
Any help would be appreciated