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HannaRob
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SF consuming wcf 4.0 web service - http works but https gives error

I am new to both WCF and SF.  I am able to get SF to call and use my wcf web service via http just fine, but the client wants it to run over https.  When i change the endpoint in Sf to the Https address, I get an error in SF of:

 

System.CalloutException: IO Exception: External server did not return any content

 

I confirmed that the https address and service works just fine externally so I am absolutely stumped.  I couldn't find much documenation on SF consuming a .net web service and what I did find was very old.

 

Thoughts?

Rob