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DNS Issue With SBS 2011

I have SBS 2011. This is a new install that has been up and running for about 4 weeks. For some reason I am having problems getting to some web sites. Such as www.att.net 
www.experts-exchange.com. The page will never load. Are there some DNS tricks that i might use to resolve this.
Thanks,
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CADRE308
Asked:
CADRE308
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1 Solution
 
ChrisCommented:
start with the basics

check you DNS server config
where are the fowarders pointed to for it  - they should be at your ISP DNs servers or free public DNS servers

Then try NSlookup up
leave it pointed at your SBS server and put in the domains your are having issues with to see if it resolves them
then using the command
server x.x.x.x  (where the x,x,x,x is the DNS external forwarder) try it again and make sure that its functioning correctly

then check by pining the wbe site to see  if its not an issue with DNs but maybe a client issue
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CADRE308Author Commented:
It does resolve. I get this return

C:\Users\TscAdmin>nslookup www.experts-exchange.com
Server:  UnKnown
Address:  fe80::6ee:d8b7:f8b:1cf6
Non-authoritative answer:
Name:    experts-exchange.com
Address:  64.156.132.140
Aliases:  www.experts-exchange.com

Attached is a screen shot of my DNS interface. I have tried checked all of them but what you see if the default

 DNS.doc
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ChrisCommented:
i have had issues in the past when the DNS server isn't listening on all interfaces

so that NSlookup is from the server and you have issues opening the wbepage from the server?
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CADRE308Author Commented:
I Checked all Interfaces, restarted the DNS Server and Client Still cant access sites such as expertes-exchange, msn, etc.
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ChrisCommented:
time to install NetMon on the client PC and try connecting to the site and see what happens

or you can use Fiddler to see what traffic is going where
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CADRE308Author Commented:
Thanks,
I'll do that when i get on site this afternoon. I'll report back then.
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CADRE308Author Commented:
As it turns out the issue was witth the cisco firewall firmware. I have no idea nor did cisco as to why it worked fine for over a week then just started acting up.
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CADRE308Author Commented:
irweazelwallis - Thank you very much for the assistance.

As it turns out the issue was with the cisco firewall firmware. I have no idea nor did cisco as to why it worked fine for over a week then just started acting up. I updated the firmware and all web sites were then accessable.
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