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...