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.frsirt.com/english/advisories/2006/4451 http://www.vuxml.org/freebsd/cca97f5f-7435-11db-91de-0008743bf21a.html
Insight
The following packages are affected:
proftpd
proftpd-mysql
