I'm really struggling to find out why this happens.
DNS server: two local windows 2003 SP 2 DNS servers(FS1 and FS2)
each workstations configured to use FS1 as primary DNS server, FS2 as secondary DNS server.
I have problem to nslookup one specific hostname which is 'service101-us.mimecast.com'.
When I nslookup the hostname from the two DNS server consoles, it resolves with no problem.
But when I nslookup from any workstation, it fails. I run nslookup to FS2 to bypass the primary DNS server by typing 'nslookup - FS2', then nslookup, it successfully resolves.
So the problem seems to be the FS1, somehow it can't resolves the specific hostname. It happens daily, so I have to restart DNS service on FS1. then the problem goes away.
Does anyone know why FS1 can't resolve only one specific external DNS hostname until restarting dns service??