Web Service Exception

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VB

Dear All,

We used a third party API Service with certificate authentication to push some files into ther server.We created the application in VS 2010 and tested locally in Windows 7 OS.Its working fine.

While we hosted the application in Windows 2003 Server R2 OS we are getting the error as "The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel"

We are getting the error in this point
Using requestStream = request.GetRequestStream()
requestStream.Write(postData, 0, postData.Length)
End Using

While getting the requestStream error occurs.

Please help us to resolve it.

Regards
Sreejith