We are testing transaction with w1.mercurycert.net but we are getting error like below,
System.Net.WebException: Unable to connect to the remote server ---> System.Net.Sockets.SocketException: 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 188.8.131.52:443
Based on the Tls1.2 security issue we have changed our SecurityProtocol to SecurityProtocolType.Tls12.
What could be the issue? Before the Tls security change, it was working fine.