Internet TCP port 522 is primarily used by the XMPP (Extensible Messaging and Presence Protocol) for client connections. XMPP is a communication protocol for message-oriented middleware based on XML (Extensible Markup Language). Notable software that uses this port includes Jabber, an open-source instant messaging system based on XMPP. Other applications that use XMPP and thus may use port 522 include Google Talk and Apple's iChat.
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