Sun Java System Instant Messaging 7.2 Administration Guide

Securing Communication Between the XMPP/HTTP Gateway and Instant Messaging Server Using StartTLS

The XMPP/HTTP Gateway only supports StartTLS for secure communications. If the multiplexor is configured to use legacy SSL, you need to configure the gateway to connect directly to the server, bypassing the multiplexor. The gateway will always attempt to use StartTLS if it is available. See Chapter 12, Securing Instant Messaging Using TLS and Legacy SSL for more information.