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buddles

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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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boxerenterprises

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Forgot to say when the sites are unavailable through IE, I can fully ping them by name
could be the MTU setting on your router. Have you recently changed router or setup on a new connection
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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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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