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Calling external Web Service


    I am calling an external web service written in .NET from
Am facing following error :

Failed: {faultcode:'soapenv:Client',faultstring:'System.CalloutException: IO Exception: Read timed out

Does it mean not able to get Web Service reference?

Would like to know the cause.

Please help if anybody faced the same.

Salesforce made the HTTP request to your URL, but never got a response within the expected timeout, this could be because either your webmethod took too long to process the request, or because your firewall is just swallowing the request packets, and the request never makes it to your actual server.
.Net WebService.Net WebService
How you called the web service written in .Net in Salesforce. Can you share the process.