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Does anyone else have trouble submitting transactions to the sandbox even though you have an A rating on SSL Labs? SSL Labs clearly shows that our server is using TLS 1.2 only, yet we cannot submit a transaction to the Authnet sandbox.

We have followed all instructions provided by Authorizenet from this link: http://community.developer.authorize.net/t5/The-Authorize-Net-Developer-Blog/Production-Certificate-Upgrades-begin-May-27-2015/bc-p/50616#M464 However, we cannot submit transa...