internet browsing - by IP ok, no name resolution

[SteveK]

I have a customer machine (WinXP Home) that has comcast cable internet. DHCP
supplying everything successfully, including 3 DNS... Customer is able to
browse web using IP addresses only. None of his clients (web, mail, news)
are able to resolve names. I disabled Firewall...

Comcast tech support and I went through the process (flushdns, netsh,
etc)... have removed and reinstalled NIC. No changes.

I can ping all DHCP supplied IP's---Gateway, DHCP, nameservers.

Is it possible to have a corrupt resolver?

 

[Robert L. \(MS-MVP\)]

It could be 3rd party security software. Have you tried clean boot? or these
search results may help too.
troubleshooting ie issues
Can't load pages from specific Web Sites Can ping public IPs but not
web sites Can't access the internet after cleaning the virus ...
www.chicagotech.net/troubleshootingie.htm

Windows general
How to run Windows OS with a clean boot · How to Run Windows
Safe Mode with Networking · How to setup DHCP for IP Phone How to sort
programs in Start ...
www.howtonetworking.com/Windows/windowsgeneral.htm



--
Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on
http://www.ChicagoTech.net
How to Setup Windows, Network, VPN & Remote Access on
http://www.HowToNetworking.com

 

[SteveK]

Hi Bob,
I disabled all Firewall software...

Able to ping all DHCP supplied addresses: gateway (router) pings
DHCP server pings
All 3 DNS servers ping
Comcast website can be browsed using IP address in IE address bar

No email clients work using names: ie: mail.domain.com

removed and reinstalled NIC

This appears to be a NAME RESOLUTION issue -- clients appear to not be
requesting DNS name resolution.

I have downloaded winsockfix but unsure whether to use it... I got a
virus(trojan) alert from AVG after clicking a link from chicagotech.net...

 

[Robert L. \(MS-MVP\)]

any errors if using nslookup? Or post back the result.

--
Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on
http://www.ChicagoTech.net
How to Setup Windows, Network, VPN & Remote Access on
http://www.HowToNetworking.com

 

[SteveK]

nslookup showed the ip of dhcp assigned nameserver

He tells me this problem started right after using a registry cleaner
tool... I tried to do system restore to just prior but system restore would
not work.

I believe something in the tcp/ip stack is corrupt...