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Can't Ping DNS

Last response: in Networking
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November 16, 2009 1:46:29 PM

I have one pc on my network that can't access the internet. I can ping the machine and log-in via remote desktop. PC can't ping the dns server. The ping reaches the gateway. Nslookup can't find server, request times out. Any ideas?

More about : ping dns

November 16, 2009 4:12:26 PM

teleman said:
I have one pc on my network that can't access the internet. I can ping the machine and log-in via remote desktop. PC can't ping the dns server. The ping reaches the gateway. Nslookup can't find server, request times out. Any ideas?


Is there any firewall rule preventing that particular host from passing a dns request through the firewall
Where is the DNS server, same LAN or is it using an outside server?
Is this a workgroup or domain?
Is that worksation using dhcp?
If not have you confirmed any static DNS settings?
Does it have a misconfigured software Fire Wall blocking port 53?
Have you checked the host file to make sure it hasn't been tampered with?
do an ipconfig /displaydns to see what, if anything is in the dns cache and then do a ipconfig /flushdns
can you ping that workstations FQDN from another workstation?

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November 16, 2009 5:07:49 PM

I'm not aware of any firewall issues;
The dns server is an outside server;
The pc is in a workgroup;
I have confirmed the static dns settings
I'm not sure how t check any blocking on port 53;
flushdns didn't have any effect
I can ping other workstations, can access the accounting server over the wan.
There are also 20+ plc's at this location that are setup the way and work ok.
Still baffled

Thanks
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November 17, 2009 12:46:03 PM

I'm pretty sure that you have a firewall rule on your gateway preventing that host from getting out. What kind of firewalll do you have?
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November 25, 2009 11:16:57 AM

Whatever the probelm was, it was solved by giving the pc a new IP address. This pc has worked for 3 or 4 years with the original address and one day just decided to quit. I don't have an onsite firewall and can only guess that it was a router nat issue. Thanks for all the replies.
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