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On my Windows XP workstation, I can find the machine I want to connect to in DNS with nslookup:

nslookup wolfman


But, when I try to connect to that machine, I get an error telling me that the machine can't be found (i.e., can't be looked up in DNS):

C:> ping wolfman
Ping request could not find host wolfman. Please check the name and try again.

I am able to connect if I use the IP address directly:

C:> ping

Pinging with 32 bytes of data:

Reply from bytes=32 time=41ms TTL=126
Reply from bytes=32 time=41ms TTL=126
Reply from bytes=32 time=44ms TTL=126
Reply from bytes=32 time=38ms TTL=126

I could work around this by adding an entry to my hosts file, but I would rather find out why this is happening. The problem is transient, most of the day I can connect to the machine just fine.

How is this possible?

ETA: I left this out for brevity, but it was asked for:

C:> ping
Ping request could not find host Please check the name and try again.

ETA: Other applications get the same results. I only tried ping to simplify. telnet can't connect, Cygwin apps print a "unknown host wolfman" message.

Update: Using wireshark, I found that my workstation is not attempting a DNS lookup. It's just reporting the "could not find host" error message.

Try ping with hostname followed by a dot. So instead of ping wolfman use ping wolfman.

That should get you resolving without having to do workarounds with hosts file, etc.

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I believe that nslookup opens a winsock connection on the DNS port and issues a query, whereas ping uses the DNS Client service. You could try and stop this service and see whether this makes a difference.

Some commands that will reinitialize various network states :

Reset WINSOCK entries to installation defaults : netsh winsock reset catalog
Reset TCP/IP stack to installation defaults : netsh int ip reset reset.log
Flush DNS resolver cache : ipconfig /flushdns
Renew DNS client registration and refresh DHCP leases : ipconfig /registerdns
Flush routing table : route /f (reboot required)

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