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(T0276) 503.3 Service unavailable while viewing a portal.

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This occurs when a portal is installed on a 64 bit SBS server with exchange or T/S gateway.

  • Locate and backup the following file:
    c:\windows\system32\inetsrv\config\applicationhost.config
  • Locate and edit any of the following entries by adding preCondition="bitness64" near the end (when you search the file for them, you will need to search without bitness64 since it may not be there yet):
    • <add name="PasswordExpiryModule" image="C:\Windows\system32\RpcProxy\RpcProxy.dll" preCondition="bitness64" />
    • <add name="exppw" image="C:\Program Files\Microsoft\Exchange Server\ClientAccess\Owa\auth\exppw.dll" preCondition="bitness64" />
    • <add name="exppw" preCondition="bitness64" />
  • Restart the web server.

These two, under isapiFilters will also need preCondition="bitness64":

  • <filter name="Exchange OWA Cookie Authentication ISAPI Filter" path="D:\Program Files\Microsoft\Exchange Server\ClientAccess\owa\auth\owaauth.dll" enabled="true" preCondition="bitness64" />
  • <filter name="Exchange ActiveSync ISAPI Filter" path="D:\Program Files\Microsoft\Exchange Server\ClientAccess\sync\bin\AirFilter.dll" enabled="true" preCondition="bitness64" />

And also, under modules on the one that has exppw.dll in its name, a little further down than the RpcProxy one.

Additional modules may require this preCondition--the Application Log in the Windows Event Viewer can be used to determine which modules, if any, are causing bitness issues.


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