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Certain websites occassionally unreachable on SBS 2008 standard domain

Every few days we get the scenario where nobody can access certain websites like google or bbc.co.uk.  However they are redirected to bing.com which is fully functional or get Internet Explorer cannot display Webpage (when connecting to google etc).

Initially thought it could be an IIS or Firewall problem but not so sure.
Server is SBS 2008 Standard, PCs are XP and Firewall is Sonicwall TZ170.
The server also incorporates BES 5.0 which has caused problems with IIS but may be a red herring.  As BES and Exchange share IIS, the SBS Web Application in IIS has stopped.

Occassionally emails stop flowing when sending externally.  A reboot cured everything...
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buddles
Asked:
buddles
3 Solutions
 
boxerenterprisesCommented:
Do you have DNS forwarders setup in the DNS console?
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buddlesAuthor Commented:
Forgot to say when the sites are unavailable through IE, I can fully ping them by name
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boxerenterprisesCommented:
could be the MTU setting on your router. Have you recently changed router or setup on a new connection
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buddlesAuthor Commented:
Router is the same but the server was migrated across from an older SBS 2003 serever using SBSmigration.  Server name and details have stayed the same.

Reading some articles, apparently this could be a known problem.

Hope it is ok to post the link:
http://blogs.technet.com/b/sbs/archive/2009/01/29/cannot-resolve-names-in-certain-top-level-domains-like-co-uk.aspx

Any thoughts?
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withtuCommented:
Yeah, SBS team already marked this known issue, so how do you think when you look into the blog article? have you got a chance to change the MaxCacheTtl registry key?

however you mentioned you can PING them without problems, which means the records were retrieved from cache, do you try other browsers so far?
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Cliff GaliherCommented:
buddles: The link you posted is accurate and is *definitely* a known problem. It has impacted very uk and au SBS installation that I've been involved with. Simply make the change or use DNS forwarders and you'll be fine.
-Cliff
 
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buddlesAuthor Commented:
Thanks for you responses.  I have applied the Reg fix and will have to see how things go.  Looks promising though.

FYI - We do not have any DNS forwarders in place
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