The remote host is missing an update to samba announced via advisory DSA 1291-3.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201291-3

The security update for CVE-2007-2444 introduced a regression in the handling of the force group share parameter if the forced group is a local Unix group for domain member servers. This update fixes this regression. For the stable distribution (etch), this regression has been fixed in version 3.0.24-6etch2. The old stable distribution (sarge) is not affected by this problem. For the testing and unstable distributions (lenny and sid, respectively), this regression will be fixed soon. We recommend that you upgrade your samba package.