Mark jabberd2-2.2.17-r1.ebuild stable.
jabberd2-2.2.17 has problems with ipv6-enabled s2s. When s2s listens on <ip>::</ip>, it supplies ipv4 addres in wrong format and can't connect/dialback to any ipv4-only jabber server. 2.3.0+ fixes this bug and also adds multiple origins for s2s.
will wait a few weeks then for stabilization... please test jabberd2-2.3.1-r1