Since 3920bis it's valid to have data in the success sasl stanza, in SASL terminology, "additional data with success". See section 7.3.6 of http://tools.ietf.org/html/draft-ietf-xmpp-3920bis-04. Loudmouth doesn't support this and will fail the MD5 authentication as the server didn't send the final data to it, which makes it impossible to log into a prosody 0.7 server with gabble 0.8
0.8 isn't worked on anymore, soz!
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