The empathy debug log shows ("empathy-debugger"):

gabbleconnection-DEBUG: 20/05/13 10:47:25.225645: gabble_connection_constructed (connection.c:547): defaulted resource to fa965dbf
wocky/-DEBUG: 20/05/13 10:47:25.343826: wocky_xmpp_writer_stream_open: wocky-xmpp-writer.c:302: Writing stream opening: <?xml version='1.0' encoding='UTF-8'?>
<stream:stream xmlns='jabber:client' xmlns:stream='http://etherx.jabber.org/streams' to="gmail.com" version="1.0">
wocky/-DEBUG: 20/05/13 10:47:25.375200: handle_stream_open: wocky-xmpp-reader.c:435: Received stream opening: stream, prefix: stream, uri: http://etherx.jabber.org/streams
wocky/-DEBUG: 20/05/13 10:47:25.375298: handle_stream_open: wocky-xmpp-reader.c:454: Stream opening attribute: from = 'gmail.com' (prefix: <no prefix>, uri: <no uri>)
wocky/-DEBUG: 20/05/13 10:47:25.375334: handle_stream_open: wocky-xmpp-reader.c:454: Stream opening attribute: id = 'BE127A149FA0DD9F' (prefix: <no prefix>, uri: <no uri>)
wocky/-DEBUG: 20/05/13 10:47:25.375366: handle_stream_open: wocky-xmpp-reader.c:454: Stream opening attribute: version = '1.0' (prefix: <no prefix>, uri: <no uri>)
wocky/-DEBUG: 20/05/13 10:47:25.375550: _end_element_ns: Received stanza
* features xmlns='http://etherx.jabber.org/streams'
    * starttls xmlns='urn:ietf:params:xml:ns:xmpp-tls'
        * required
    * mechanisms xmlns='urn:ietf:params:xml:ns:xmpp-sasl'
        * mechanism
            "X-OAUTH2"
        * mechanism
            "X-GOOGLE-TOKEN"
wocky/-DEBUG: 20/05/13 10:47:25.375628: _write_node_tree: Serializing tree:
* starttls xmlns='urn:ietf:params:xml:ns:xmpp-tls'
wocky/-DEBUG: 20/05/13 10:47:25.401357: _end_element_ns: Received stanza
* proceed xmlns='urn:ietf:params:xml:ns:xmpp-tls'
gabbletls-DEBUG: 20/05/13 10:47:25.694149: gabble_server_tls_manager_verify_async (server-tls-manager.c:340): verify_async() called on the GabbleServerTLSManager.
gabbletls-DEBUG: 20/05/13 10:47:25.694252: gabble_server_tls_manager_verify_async (server-tls-manager.c:362): ignore-ssl-errors is set, fallback to non-interactive verification.
wocky/-DEBUG: 20/05/13 10:47:25.725522: wocky_xmpp_writer_stream_open: wocky-xmpp-writer.c:302: Writing stream opening: <?xml version='1.0' encoding='UTF-8'?>
<stream:stream xmlns='jabber:client' xmlns:stream='http://etherx.jabber.org/streams' to="gmail.com" version="1.0">
wocky/-DEBUG: 20/05/13 10:47:25.805485: handle_stream_open: wocky-xmpp-reader.c:435: Received stream opening: stream, prefix: stream, uri: http://etherx.jabber.org/streams
wocky/-DEBUG: 20/05/13 10:47:25.805557: handle_stream_open: wocky-xmpp-reader.c:454: Stream opening attribute: from = 'gmail.com' (prefix: <no prefix>, uri: <no uri>)
wocky/-DEBUG: 20/05/13 10:47:25.805599: handle_stream_open: wocky-xmpp-reader.c:454: Stream opening attribute: id = '22DE5ED1D43B1939' (prefix: <no prefix>, uri: <no uri>)
wocky/-DEBUG: 20/05/13 10:47:25.805633: handle_stream_open: wocky-xmpp-reader.c:454: Stream opening attribute: version = '1.0' (prefix: <no prefix>, uri: <no uri>)
wocky/-DEBUG: 20/05/13 10:47:25.805804: _end_element_ns: Received stanza
* features xmlns='http://etherx.jabber.org/streams'
    * mechanisms xmlns='urn:ietf:params:xml:ns:xmpp-sasl'
        * mechanism
            "X-OAUTH2"
        * mechanism
            "X-GOOGLE-TOKEN"
        * mechanism
            "PLAIN"
gabbleauthentication-DEBUG: 20/05/13 10:47:25.806236: gabble_server_sasl_channel_start_auth_async (server-sasl-channel.c:814): Starting authentication
gabbleauthentication-DEBUG: 20/05/13 10:48:26.299539: gabble_server_sasl_channel_close (server-sasl-channel.c:965): called on 0x1cb73f0
gabbleauthentication-DEBUG: 20/05/13 10:48:26.299585: gabble_server_sasl_channel_close (server-sasl-channel.c:971): closed channel
wocky/-DEBUG: 20/05/13 10:48:26.299727: auth_failed: wocky-sasl-auth.c:274: Authentication failed!: Client aborted authentication.
gabbleconnection-DEBUG: 20/05/13 10:48:26.299818: connector_error_disconnect (connection.c:1772): connection failed: WOCKY_AUTH_ERROR_FAILURE (#6): Client aborted authentication.
gabbleroster-DEBUG: 20/05/13 10:48:26.299913: gabble_roster_close_all (roster.c:1692): closing channels