Summary
The remote host is missing an update to the system as announced in the referenced advisory.
Solution
Update your system with the appropriate patches or software upgrades.
http://www.redmine.org/news/53
http://www.vuxml.org/freebsd/cf96cd8d-48fb-11e0-98a6-0050569b2d21.html
Insight
The following package is affected: redmine