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connecting to ejabberd 15.09 with advertised X-OAUTH2 login mechanism fails

Submitted by Christian Weiske

Link to original bug (#758560)

Description

After upgrading my ejabberd server from version 2.x to 15.09, empathy on ubuntu 14.04 (3.8.6-0ubuntu9.2) did not connect anymore to the server. I got a "login failed" message.

The empathy-debugger logs showed three advertised login mechanisms:

* mechanisms xmlns='urn:ietf:params:xml:ns:xmpp-sasl'
    * mechanism
        "PLAIN"
    * mechanism
        "X-OAUTH2"
    * mechanism
        "SCRAM-SHA-1"

After disabling X-OAUTH2 with

disable_sasl_mechanisms: ["digest-md5", "X-OAUTH2"]

in ejabberd.yml and restarting the daemon, empathy started to connect again.

I think empathy should simply skip unknown login mechanisms.

Version: 3.8.x