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OLE DB Provider was not specified in the connection string.

I am trying to configure a 32bit !!S web services application to work on Windows 2008 R1 64bit which connects to an Oracle database.  On the Web Services server I have an Oracle 32bit client installed, a Application pool for 32 bit applications, and my connection string is correct.  When I try to send to the web service I get the following error " Server was unable to process request An OLE DB Provider was not specified in the ConnectionString".  I have a Windows 2008 R1 32bit environment setup exactly the same and it works fine.  Are there any issues using a Oracle 32 bit client on a Windows 2008 64bit machine? Or should I say problems accessing classes?

Thanks
Brian
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Top Expert 2011
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I ended up having an issue with the web.config, thanks for your help.