Im having a problem on a MOSS 2007 farm where if I try & open a spreadsheet in Excel web services I get the error:

Excel Web Access

An error has occurred.

Please contact your system administrator if this problem persists

And in the Sharepoint logs:

Error http://myserver:56737/SharedServices1/ExcelCalculationServer/ExcelService.asmx exception: The request failed with HTTP status 403: Forbidden (Forbidden port)

If I search Google there doesnt appear to be any results for the error ‘The request failed with HTTP status 403: Forbidden (Forbidden port)’ and Im really stumped now.

If anyones got any ideas much appreciated !

TIA……..

UPDATE: If you get this problem the solution in my case was to by pass the proxy for local requests, this was done by editting the web.config for the relevant web app & adding:

<system.net>
   <defaultProxy>
   <proxy proxyaddress="http://<ProxyServer>:<port>" bypassonlocal = "true"/>
   </defaultProxy>
</system.net>

Some more info about bypassonlocal can be found here: ByPassOnLocal MS KB

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Typical error message:

Contact the workbook author.”

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