Ever since the Authorize.net update on Thursday night our Merchant account has not worked. Ccard fail with following msg:
Request Aborted. Could not create SSL/TLS Secure Channel

We have a DigiCert RSA certificate running on a Windows 2012 R2 webserver.

The transaction Key has been updated.

When we run the SSLlabs tool for our website we get
# TLS 1.2 (suites in server-preferred order)
TLS_DHE_RSA_WITH_AES_256_GCM_SHA384 (0x9f) DH 1024 bits
As the number one entry.

Authorize.net prefers ECDHE with GCM ciphers (only prefers), but we have DHE with GCM – a GMC cipher and the reason for the change by Authorize.net.

Does anyone have ideas about what we should do next?

Tnks