sbs can ping internet but not browse

Two unrelated client sites have lost ability to connect to the internet since taking in critical updates from Microsoft  on 28th Oct 2008.

Both SBS installations

Other relevant points:-
1) The server is able to ping qualified domain names such as bbc.co.uk
2) Client workstations can browse the internet
3) Other TCP/IP services (ie: pop mail pickup, microsoft updates & antivirus updates are unable to connect to internet.
4) Server cannot browse Companyweb but clients workstations can.
5) Both installations are set up with a 2 x NIC configuration

Steps taken:-
1) Re-set IPStack & Winsock  
2) Downgraded to IE6 made no difference
greenonredAsked:
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SysExpertCommented:
see if you can roll back the latest patch until MS fixes it.

I hope this helps !
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SysExpertCommented:
Anything in the EVENT logs or other logs ?

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sk_raja_rajaCommented:
(i)Sounds more like a router issue or firewall issue.  Do you have anytype of network filtering?  First thing to check do nslookup cnn.com on a machine from a command prompt.  Then if you get a bunch of reponses, do a telenet to one of the ip addresses like this  TELNET xxx.xxx.xxx.xxx 80  

See if you get a blank screen or just a can't connect.. if you get anything other than can't connect then you are connecting and it's something else, if you get can't connect something is blocking you from getting to that website on port 80 and you probably need to look at filtering devices software other than that machine.. if the machine gets can't connect then you probably need to start looking at internet security software on the machine

(ii)are you using the internal dns server..? check the dns address of your internal dns and isp dns address settings

(iii)Sounds like a firewall might still be active and blocking you even though you believe it to be uninstalled or disabled.
http://forums.mozillazine.org/viewtopic.php?p=2295421#2295421 Top 12 Ways a Firewall Can Trick You

Have you checked this machine for Virus, not just malware

(iv)Do you have any malicious programs set to run on startup?  Check by opening regedit, then navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

Do you have any programs that may be blocking you, like Norton Internet Security or some kind of firewall?  Are you connecting through a cable or a wireless access point?

(v)First, you need to determine if DNS is still working properly.  If you are experiencing a DNS issue, then you could still ping an IP address on the internet, but would not be able to resolve or ping a URL.

When you are unable to browse, goto a CMD prompt and type "ping www.google.com".  If you don't get replies, try "ping 198.6.1.5".  If you do get replies from that one but not the other, then it is a DNS issue.

If both ping fine, you can reset the IP stack very simply with this command:
"netsh int ip reset c:/netsh.log"
Then reboot and see if the problem persists.
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greenonredAuthor Commented:
All solved, this turned out to be AVG corporate anti-virus on the server.
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