I'm doing SOAP authorize.net things in the sandbox environment.

There's a document that tells me how to do that.

There is a (poorly indicated) WSDL specified in that document.

That WSDL specifies a service address: https://oce-ex-cert-api.authorize.net/soap/v1/Service.asmx

This has all worked flawlessly since December when I first integrated authorize.net. Yesterday I noticed that I couldn't transact in the sandbox any longer and a DNS error appears in my logs.

When I perform a DNS lookup on oce-ex-cert-api.authorize.net I receive an NXDOMAIN error message, which indicates that the domain requested does not exist.

I contacted Authorize.net support directly and was informed that this issue is "too detailed" and that I should use these forums to address the issue. I additionally emailed developer@authorize.net yesterday but haven't heard back yet.

Any assistance would be greatly appreciated.