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://rsync.samba.org/#security_apr04 http://www.vuxml.org/freebsd/73ea0706-9c57-11d8-9366-0020ed76ef5a.html

The following package is affected: rsync CVE-2004-0426 rsync before 2.6.1 does not properly sanitize paths when running a read/write daemon without using chroot, which allows remote attackers to write files outside of the module's path.