The remote host is missing an update to the system as announced in the referenced advisory FreeBSD-SA-04:11.msync.asc

Upgrade your system to the appropriate stable release or security branch dated after the correction date https://secure1.securityspace.com/smysecure/catid.html?in=FreeBSD-SA-04:11.msync.asc

The msync(2) system call is used by applications to request that modified memory pages are written to permanent storage. Programming errors in the implementation of the msync(2) system call involving the MS_INVALIDATE operation lead to cache consistency problems between the virtual memory system and on-disk contents.