The underlying connection was closed: An unexpected error occurred on a send

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#1

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.

Thanks, the problem was not related to authorize.net, It was proxy blocking the secure.authorize.net site.
Please help me…