Our production site uses ColdFusion MX 7 and is on a Linux server; it now fails on calls to Authorize.net within Sandbox. I get a response back from all Authorize.net transactions of:  "Connection Failure."

We are using a CFHTTP (method=POST) call to:  https://test.authorize.net/gateway/transact.dll

OUr production environment satisfies all of this criteria:
--Your certificate store includes certificates for Root 2 - GeoTrust Global CA
--Your security transport—the part that negotiates TLS—supports SHA-256
--Your solution does not connect directly to Authorize.Net using an IP address
--Your solution’s firewall is not set to whitelist Authorize.Net IP addresses for outbound connections

Our site uses:  PKCS #1 SHA-256 With RSA Encryption

I verified that ColdFusion MX 7 is compatible with SHA-2.

Please advise if anyone knows of a solution or something I can do to debug the issue.