https://community.developer.cybersource.com/t5/Integration-and-Testing/ERROR-The-underlying-connection-was-closed-An-unexpected-error/m-p/60156#M34719 <P>ERROR:- The underlying connection was closed: An unexpected error occurred on a send. Expain:- Would you mind explaining what it was, exactly, that fixed your issue? We're seeing the same thing and I'm curious what resolved your issue.</P><P>Thanks, the problem was not related to authorize.net, It was proxy blocking the secure.authorize.net site.<BR />Please help me..</P><P>using language in c# net applications</P> Tue, 10 Oct 2017 05:56:08 GMT manishsainimmak 2017-10-10T05:56:08Z https://community.developer.cybersource.com/t5/Integration-and-Testing/ERROR-The-underlying-connection-was-closed-An-unexpected-error/m-p/60156#M34719 <P>ERROR:- The underlying connection was closed: An unexpected error occurred on a send. Expain:- Would you mind explaining what it was, exactly, that fixed your issue? We're seeing the same thing and I'm curious what resolved your issue.</P><P>Thanks, the problem was not related to authorize.net, It was proxy blocking the secure.authorize.net site.<BR />Please help me..</P><P>using language in c# net applications</P> Tue, 10 Oct 2017 05:56:08 GMT https://community.developer.cybersource.com/t5/Integration-and-Testing/ERROR-The-underlying-connection-was-closed-An-unexpected-error/m-p/60156#M34719 manishsainimmak 2017-10-10T05:56:08Z