Apr 09, 2018 01:37 PM|mgebhard|LINK
The following error usually means the service is not running or the client is not sending the proper credentials.
The underlying connection was closed: An unexpected error occurred on a send
should i change all of addresses in the wsdl file to https ?
The WSDL is used to generate the client proxy code. Make sure you're web.config or client is pointing to HTTPS.
I suggest that you contact the service owner and ask for assistance.