During the week of March 16 - 20, 2009, Authorize.Net will be deprecating all legacy support for the SSL 2.0 protocol. Changes have recently been made to the Payment Card Industry Data Security Standard (PCI DSS) which have made the use of SSL 2.0 a PCI DSS violation.
Due to this change, it is critical that you update any applications or integrations that may be using the SSL 2.0 protocol to support the more current SSL 3.0/TLS 1.0 protocols. Failure to upgrade your applications or integrations may result in a lost ability to successfully process transactions via the Authorize.Net Payment Gateway.
If you have merchants who are currently using SSL 2.0 to connect to the Authorize.Net Payment Gateway, you must contact them immediately and arrange to update their integrations to the SSL 3.0/TLS 1.0 protocols.
For more information on the limitations of SSL 2.0 and the advantages of SSL 3.0/TLS 1.0, we recommend reviewing the white paper Analysis of the SSL 3.0 Protocol.
If you have any questions, please contact firstname.lastname@example.org.