Error Message: The underlying connection was closed: An unexpected error occurred on a send. (System.Web.Services)
Action:
My Salesforce connections have suddenly started giving errors. Attached is the error message I am recieving on testing the connections .Please note the connections were working fine until yesterday and I am getting same issue for both Production and test sandbox.
Error Message:
The underlying connection was closed: An unexpected error occurred on a send. (System.Web.Services)Additional information: Unable to read data from the transport connection: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond. (System)
Solutions:
This error message is most likely caused by an internal firewall and/or change in network policy.More Information: SOAP API request - TLS Fingerprint Detection was considered by Security team as a threat and was blocked at the firewall layer ( Requests should be white listed ) .
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Error Message: The underlying connection was closed: An unexpected error occurred on a send. (System.Web.Services)
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