strange DNS client problem

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periphonics_jphaneuf

Hi,

I have encountered a strange problem with one of my customer's win2k
systems. For some reason the system can't ping some computers on the
network by hostname, but it can ping the same computer by IP address.
When pinging by hostname, I get the "Unknown host" message. I did a
ipconfig /displaydns and this is all that comes back despite the host
file having all kinds of entries (not newly added):

c:\>ipconfig /displaydns

Windows 2000 IP Configuration

c:\>

If I stop the DNS Client service however, I can ping the host by
hostname. After restarting the DNS Client service, the displaydns
shows the same. I then tried ipconfig /flushdns, but that doesn't
change the displaydns output either. I rebooted the system and
everything was back to normal and I could ping by hostname.

Does anyone know what could cause the DNS Resolver cache to get in this
seemingly empty state?

Thanks,
J Phaneuf
 
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A

Ace Fekay [MVP]

In
Hi,

I have encountered a strange problem with one of my customer's win2k
systems. For some reason the system can't ping some computers on the
network by hostname, but it can ping the same computer by IP address.
When pinging by hostname, I get the "Unknown host" message. I did a
ipconfig /displaydns and this is all that comes back despite the host
file having all kinds of entries (not newly added):

c:\>ipconfig /displaydns

Windows 2000 IP Configuration

c:\>

If I stop the DNS Client service however, I can ping the host by
hostname. After restarting the DNS Client service, the displaydns
shows the same. I then tried ipconfig /flushdns, but that doesn't
change the displaydns output either. I rebooted the system and
everything was back to normal and I could ping by hostname.

Does anyone know what could cause the DNS Resolver cache to get in
this seemingly empty state?

Thanks,
J Phaneuf

Possibly a virus or spyware? Have you ran a complete scan on the machine for
either or both?

What errors are in the Event viewer? Is this the only workstation it's
happening on? If you ran an ipconfig /all, does it give you it's config or
does it do the same thing as the displaydns switch?

--
Ace
Innovative IT Concepts, Inc (IITCI)
Willow Grove, PA

This posting is provided "AS-IS" with no warranties or guarantees and
confers no rights.

Ace Fekay, MCSE 2003 & 2000, MCSA 2003 & 2000, MCSE+I, MCT, MVP
Microsoft MVP - Directory Services
Microsoft Certified Trainer

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