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I've noticed that all over my network, when I nslookup any PC or server, I get "Server: Unknown" even though the DNS looks like working fine and there hasn't been any problem with name resolution in my wide multi-subnet and multi-server environment.
But recently one of our weird server applications couldn't locate some hosts, and the vendor claims that it's because of this issue.
I can ping those hosts from the respective server with no issue. And I even changed the DNS on this server to match the DNS on those hosts to no avail.
I read in more than a place that the reverse zone or pointer records can be responsible for that. But I tried nslookup on a PC that has correct A & pointer records. No difference.
How can I rectify this nslookup issue?
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Hello @ Soar
Have you tried to specify a DNS server nslookup -IP 8.8.8.8, can it resolve the address ?
Also flush DNS cache: ipconfig /flushdn
Next try temporarily disabling any firewall or antivirus software and see if the issue is resolved.
From PC01, I did:
ipconfig /flushdns
Then,
nslookup pc02
Server: Unknown
But the server address, FQDN of PC02 and its address are given and correct.
Then,
nslookup 8.8.8.8
Server: Unknown
But the server address is given and correct. And the rest is:
Name: dns.google
Address: 8.8.8.8
I'll try disabling the AV later and tell you.
The firewall should not be a factor as it's on the router, and both PCs are in the same subnet.
I disabled the AV on both PC, did nslookup from PC01 to PC02. The result is the same.