DNS Forwarding Problems, Win2k3, can't access some websites

Hi, I think I am having a forwarding issue, but can't figure out how to resolve it.  I have a small company network that is using a cable modem to connect to their ISP through a Pix firewall.  The outside IP is static, the inside is DHCP from the server, a Win2003 SBS.  The server does DNS for the internal network, and is configured to forward Internet queries to the 2 DNS servers from the ISP.  The users and server can all get to most websites, but there are some, like www.yahoo.com, that cannot be found.  They can get to email.yahoo.com and search.yahoo.com, but not the www.  I checked the host file, flushed DNS, can't get a response from nslookup beyond the server itself, and tracert times out.  So I added the ISP DNS servers to the IP configuration for the clients, and now they can get to the sites, so I know there is some issue with the Windows DNS.  I'd like to fix this so that the work around isn't neccessary, which it shouldn't be...  I've seen a couple other issues like this when I search the forums, but nothing like a real answer.  If anyone has an idea, please let me know.  Thanks!
srpoageAsked:
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moduloConnect With a Mentor Commented:
PAQed with points refunded (250)

modulo
Community Support Moderator
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brian_appliedcpuCommented:
try ipconfig /flushdns on the servers and the clients.
Flush the dns on the servers thru the mmc interface
Scavange
Update
Clear the cache on the servers.

Else use a nslookup to query the dns server for who it knows is www.yahoo.com
switch dns servers.
do again for each of the isps servers
Command syntax

C:\>nslookup
> server ns1.twtelecom.net
Default Server:  ns1.twtelecom.net
Address:  216.136.95.2

www.yahoo.com
Server:  ns1.twtelecom.net
Address:  216.136.95.2

Non-authoritative answer:
Name:    www.yahoo.akadns.net
Addresses:  216.109.118.72, 216.109.118.75, 216.109.117.107, 216.109.117.110
          216.109.117.204, 216.109.117.206, 216.109.118.65, 216.109.118.69
Aliases:  www.yahoo.com

Be aware that some dns owners do not allow outside servers to query against them so it is best to use your isp's but sometimes they have issues.  All else fails, call your isp, get someone who knows what they are talking about and ask them to query it.


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RDAdamsCommented:
Ok, you can connect to some websites but not others?  Can you get to their IP addresses www.yahoo.com 216.109.118.66 in the browser?
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brian_appliedcpuCommented:
RAdams...that would indicate a browser hijack...good thinking.
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srpoageAuthor Commented:
I figured out the problem- it was the Linksys router having errors.  Took it out and problem gone.  Oh, well.  Thanks all!
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brian_appliedcpuCommented:
Glad he was able to trace the problem down and isolate it to the router.

bkl
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