The remote host is missing an update to tgt announced via advisory DSA 2209-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%202209-1

Emmanuel Bouillon discovered a double free in tgt, the Linux SCSI target user-space tools, which could lead to denial of service. The oldstable distribution (lenny) doesn't include tgt. For the stable distribution (squeeze), this problem has been fixed in version 1:1.0.4-2squeeze1. For the unstable distribution (sid), this problem has been fixed in version 1:1.0.4-3 We recommend that you upgrade your tgt packages.