PidginはFacebookチャットに接続できません
しばらくして、PidginでFacebookアカウントに接続しようとしました。前回と同じアカウント設定（2014年2月）。しかし今、接続は失敗します。
エラーは常に同じ「接続が閉じられました」です。ここに、ログファイルからの最後のサーバー応答があります。
(13:20:13) Jabber: Recv (ssl)(232): <iq from='chat.facebook.com' id='purple74e1cde0' type='error'><query xmlns='http://Jabber.org/protocol/disco#items'/><error code='501' type='cancel'><feature-not-implemented xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'/></error></iq>
(13:20:13) Jabber: Recv (ssl)(234): <iq from='proxy.eu.Jabber.org' id='purple74e1cde1' type='error'><query xmlns='http://Jabber.org/protocol/bytestreams'/><error code='501' type='cancel'><feature-not-implemented xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'/></error></iq>
問題がどこにあるのか-実装されていないものとその修正方法-の設定や一部のプラグインで何かを変更（無効化）できますか？完全なログは次のとおりです。
(13:20:10) account: Connecting to account [email protected]/.
(13:20:10) Perl: ret_val = (nil)
(13:20:10) connection: Connecting. gc = 0x7f2bcac79de0
(13:20:10) dnssrv: querying SRV record for chat.facebook.com: _xmpp-client._tcp.chat.facebook.com
(13:20:10) dnssrv: found 1 SRV entries
(13:20:10) dnsquery: Performing DNS lookup for chat.facebook.com
(13:20:10) dns: Wait for DNS child 2556 failed: Žádný potomek neexistuje
(13:20:10) dns: Created new DNS child 3277, there are now 1 children.
(13:20:10) dns: Successfully sent DNS request to child 3277
(13:20:10) dns: Got response for 'chat.facebook.com'
(13:20:10) dnsquery: IP resolved for chat.facebook.com
(13:20:10) proxy: Attempting connection to 2a03:2880:21:f05:face:b00c:0:133
(13:20:10) proxy: Connecting to chat.facebook.com:5222 with no proxy
(13:20:10) proxy: Connection in progress
(13:20:10) proxy: Connecting to chat.facebook.com:5222.
(13:20:10) proxy: Connected to chat.facebook.com:5222.
(13:20:10) Jabber: Sending ([email protected]): <?xml version='1.0' ?>
(13:20:10) Jabber: Sending ([email protected]): <stream:stream to='chat.facebook.com' xmlns='Jabber:client' xmlns:stream='http://etherx.Jabber.org/streams' version='1.0'>
(13:20:10) Jabber: Recv (389): <?xml version='1.0' ?><stream:stream from='chat.facebook.com' id='1' version='1.0' xmlns:stream='http://etherx.Jabber.org/streams' xmlns='Jabber:client' xml:lang='en'><stream:features><starttls xmlns='urn:ietf:params:xml:ns:xmpp-tls'/><mechanisms xmlns='urn:ietf:params:xml:ns:xmpp-sasl'><mechanism>X-FACEBOOK-PLATFORM</mechanism><mechanism>PLAIN</mechanism></mechanisms></stream:features>
(13:20:10) Jabber: Sending ([email protected]): <starttls xmlns='urn:ietf:params:xml:ns:xmpp-tls'/>
(13:20:11) Jabber: Recv (50): <proceed xmlns='urn:ietf:params:xml:ns:xmpp-tls'/>
(13:20:11) gnutls: Starting handshake with chat.facebook.com
(13:20:11) gnutls: Handshake complete
(13:20:11) gnutls/x509: Key print: 21:f1:6b:d6:61:95:d5:b4:3a:06:b4:e9:a0:50:7e:15:30:56:2e:d3
(13:20:11) gnutls/x509: Key print: 42:85:78:55:fb:0e:a4:3f:54:c9:91:1e:30:e7:79:1d:8c:e8:27:05
(13:20:11) gnutls: Peer provided 2 certs
(13:20:11) gnutls: Lvl 0 SHA1 fingerprint: 21:f1:6b:d6:61:95:d5:b4:3a:06:b4:e9:a0:50:7e:15:30:56:2e:d3
(13:20:11) gnutls: Serial: 0e:d4:76:ae:d4:8f:08:69:d3:b7:f3:1a:16:fc:76:3d
(13:20:11) gnutls: Cert DN: C=US,ST=CA,L=Menlo Park,O=Facebook\, Inc.,CN=chat.facebook.com
(13:20:11) gnutls: Cert Issuer DN: C=US,O=DigiCert Inc,OU=www.digicert.com,CN=DigiCert High Assurance CA-3
(13:20:11) gnutls: Lvl 1 SHA1 fingerprint: 42:85:78:55:fb:0e:a4:3f:54:c9:91:1e:30:e7:79:1d:8c:e8:27:05
(13:20:11) gnutls: Serial: 0a:5f:11:4d:03:5b:17:91:17:d2:ef:d4:03:8c:3f:3b
(13:20:11) gnutls: Cert DN: C=US,O=DigiCert Inc,OU=www.digicert.com,CN=DigiCert High Assurance CA-3
(13:20:11) gnutls: Cert Issuer DN: C=US,O=DigiCert Inc,OU=www.digicert.com,CN=DigiCert High Assurance EV Root CA
(13:20:11) certificate/x509/tls_cached: Starting verify for chat.facebook.com
(13:20:11) certificate/x509/tls_cached: Checking for cached cert...
(13:20:11) certificate/x509/tls_cached: ...Found cached cert
(13:20:11) gnutls: Attempting to load X.509 certificate from /home/cigi/.purple/certificates/x509/tls_peers/chat.facebook.com
(13:20:11) certificate/x509/tls_cached: Peer cert matched cached
(13:20:11) util: Writing file /home/cigi/.purple/certificates/x509/tls_peers/chat.facebook.com
(13:20:11) certificate: Successfully verified certificate for chat.facebook.com
(13:20:11) Jabber: Sending (ssl) ([email protected]): <stream:stream to='chat.facebook.com' xmlns='Jabber:client' xmlns:stream='http://etherx.Jabber.org/streams' version='1.0'>
(13:20:11) Jabber: Recv (ssl)(338): <?xml version='1.0' ?><stream:stream from='chat.facebook.com' id='1' version='1.0' xmlns:stream='http://etherx.Jabber.org/streams' xmlns='Jabber:client' xml:lang='en'><stream:features><mechanisms xmlns='urn:ietf:params:xml:ns:xmpp-sasl'><mechanism>X-FACEBOOK-PLATFORM</mechanism><mechanism>PLAIN</mechanism></mechanisms></stream:features>
(13:20:11) sasl: Mechs found: X-FACEBOOK-PLATFORM PLAIN
(13:20:11) Jabber: Sending (ssl) ([email protected]): <auth xmlns='urn:ietf:params:xml:ns:xmpp-sasl' mechanism='PLAIN' xmlns:ga='http://www.google.com/talk/protocol/auth' ga:client-uses-full-bind-result='true'>password removed</auth>
(13:20:12) Jabber: Recv (ssl)(51): <success xmlns='urn:ietf:params:xml:ns:xmpp-sasl'/>
(13:20:12) Jabber: Sending (ssl) ([email protected]): <stream:stream to='chat.facebook.com' xmlns='Jabber:client' xmlns:stream='http://etherx.Jabber.org/streams' version='1.0'>
(13:20:12) Jabber: Recv (ssl)(304): <?xml version='1.0' ?><stream:stream from='chat.facebook.com' id='1' version='1.0' xmlns:stream='http://etherx.Jabber.org/streams' xmlns='Jabber:client' xml:lang='en'><stream:features><bind xmlns='urn:ietf:params:xml:ns:xmpp-bind'/><session xmlns='urn:ietf:params:xml:ns:xmpp-session'/></stream:features>
(13:20:12) Jabber: Sending (ssl) ([email protected]): <iq type='set' id='purple74e1cdda'><bind xmlns='urn:ietf:params:xml:ns:xmpp-bind'/></iq>
(13:20:12) Jabber: Recv (ssl)(177): <iq from='[email protected]' id='purple74e1cdda' type='result'><bind xmlns='urn:ietf:params:xml:ns:xmpp-bind'><jid>[email protected]/xxxxxxxx</jid></bind></iq>
(13:20:12) Jabber: Sending (ssl) ([email protected]/xxxxxxxx): <iq type='set' id='purple74e1cddb'><session xmlns='urn:ietf:params:xml:ns:xmpp-session'/></iq>
(13:20:13) Jabber: Recv (ssl)(131): <iq from='[email protected]' id='purple74e1cddb' type='result'><session xmlns='urn:ietf:params:xml:ns:xmpp-session'/></iq>
(13:20:13) Jabber: Sending (ssl) ([email protected]/xxxxxxxx): <iq type='get' id='purple74e1cddc' to='chat.facebook.com'><query xmlns='http://Jabber.org/protocol/disco#items'/></iq>
(13:20:13) Jabber: Sending (ssl) ([email protected]/xxxxxxxx): <iq type='get' id='purple74e1cddd' to='chat.facebook.com'><query xmlns='http://Jabber.org/protocol/disco#info'/></iq>
(13:20:13) Jabber: Recv (ssl)(232): <iq from='chat.facebook.com' id='purple74e1cddc' type='error'><query xmlns='http://Jabber.org/protocol/disco#items'/><error code='501' type='cancel'><feature-not-implemented xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'/></error></iq>
(13:20:13) Jabber: Recv (ssl)(312): <iq from='chat.facebook.com' id='purple74e1cddd' type='result'><query xmlns='http://Jabber.org/protocol/disco#info'><identity category='server' type='Facebook XMPP'/><feature var='http://Jabber.org/protocol/commands'/><feature var='http://Jabber.org/protocol/chatstates'/><feature var='vcard-temp'/></query></iq>
(13:20:13) Jabber: Sending (ssl) ([email protected]/xxxxxxxx): <iq type='get' id='purple74e1cdde'><vCard xmlns='vcard-temp'/></iq>
(13:20:13) Jabber: Sending (ssl) ([email protected]/xxxxxxxx): <iq type='get' id='purple74e1cddf'><query xmlns='Jabber:iq:roster'/></iq>
(13:20:13) Jabber: Sending (ssl) ([email protected]/xxxxxxxx): <iq type='get' id='purple74e1cde0' to='chat.facebook.com'><query xmlns='http://Jabber.org/protocol/disco#items' node='http://Jabber.org/protocol/commands'/></iq>
(13:20:13) Jabber: Sending (ssl) ([email protected]/xxxxxxxx): <iq type='get' id='purple74e1cde1' to='proxy.eu.Jabber.org'><query xmlns='http://Jabber.org/protocol/bytestreams'/></iq>
(13:20:13) Jabber: Recv (ssl)(232): <iq from='chat.facebook.com' id='purple74e1cde0' type='error'><query xmlns='http://Jabber.org/protocol/disco#items'/><error code='501' type='cancel'><feature-not-implemented xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'/></error></iq>
(13:20:13) Jabber: Recv (ssl)(234): <iq from='proxy.eu.Jabber.org' id='purple74e1cde1' type='error'><query xmlns='http://Jabber.org/protocol/bytestreams'/><error code='501' type='cancel'><feature-not-implemented xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'/></error></iq>
(13:20:13) Jabber: Discovered bytestream proxy server: jid='proxy.eu.Jabber.org' Host='' port='0' zeroconf=''
FacebookチャットXMPPサーバーは、PidginやempathyなどのJabberクライアントで機能しなくなりました。
以下のリンクで回答を見つけることができます：