"А" записи для домена сменил 3 дня назад.
SRV _xmpp-server._tcp.conference 21600 IN SRV 20 0 5269 domain-xmpp.yandex.net. 21600
SRV _xmpp-server._tcp 21600 IN SRV 20 0 5269 domain-xmpp.yandex.net. 21600
SRV _xmpp-client._tcp.conference 21600 IN SRV 20 0 5222 domain-xmpp.yandex.net. 21600
SRV _xmpp-client._tcp 21600 IN SRV 20 0 5222 domain-xmpp.yandex.net. 21600