We have a windows 2003 DNS Server (Not AD integrated)... non-secure update enabled. All the client systems pointing to that DNS using DHCP options.
Now the problem is the clients can ping a system using FQDN most of the times and sometimes they can't.
When it stops working ipconfig /flushdns don't make any differrence.
After doing a repair in network connection it starts working.
Please suggest what could be the possible cause of this problem?