The remote host is missing an update to the system as announced in the referenced advisory.

Update your system with the appropriate patches or software upgrades. http://xmpp.org/resources/security-notices/server-dialback/ http://www.vuxml.org/freebsd/4d1d2f6d-ec94-11e1-8bd8-0022156e8794.html

The following package is affected: jabberd CVE-2012-3525 s2s/out.c in jabberd2 2.2.16 and earlier does not verify that a request was made for an XMPP Server Dialback response, which allows remote XMPP servers to spoof domains via a (1) Verify Response or (2) Authorization Response.