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XMPP over SSL
Port 5223 is primarily used for secure client connections in the Extensible Messaging and Presence Protocol (XMPP). It enables encrypted communication between XMPP clients and servers, facilitating secure instant messaging, presence information exchange, and collaboration applications. Historically, this port has been used to support SSL/TLS encrypted connections for clients needing to protect data in transit..
Extensible Messaging and Presence Protocol (XMPP) is an open XML-based protocol designed for near real-time communication, including instant messaging, presence updates, and contact management. Port 5223 was traditionally reserved for clients to establish an SSL/TLS encrypted tunnel immediately upon connection, prior to sending any XMPP data. This method is known as 'old-style SSL' or 'legacy SSL'.
Today, the preferred approach for securing XMPP client-to-server connections is STARTTLS on port 5222, where a plaintext connection is upgraded to encrypted after initial protocol negotiation. Despite this, port 5223 remains in use for backward compatibility with legacy clients that expect immediate TLS negotiation.
XMPP supports a range of extensions (XEPs), enabling additional functionality such as file transfers, multi-user chat, and push notifications. The traffic over port 5223 is encrypted at the transport level, safeguarding these diverse functions from passive interception.