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This article applies to: ML v7, ML8, MultiStore

"Error calling XXXX gateway. Please retry your order in a few minutes or select another checkout payment option."

Upon checkout, the above mentioned error is returned.  This is generally a communication issue between AspDotNetStorefront and the gateway.  Trust policies on the server may cause this (e.g. The server is set to medium trust and does not allow sockets access).  It may also be caused by a DNS issue or a firewall problem preventing the connection.

Check if your gateway URLs are correct in the AppConfigs.  Test the URLs in the AppConfigs by trying to browse to them in Internet Explorer.  The pages should load (though you'll get an error of some kind, as you're not submitting all the proper info).  If a 404 error is returned, you may have a network or firewall issue.