The remote host is missing an update to linux-2.6.24 announced via advisory DSA 1928-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201928-1

Several vulnerabilities have been discovered in the Linux kernel that may lead to a denial of service, sensitive memory leak or privilege escalation. For details on the issues addressed in this update, please visit the referenced security advisories. For the oldstable distribution (etch), this problem has been fixed in version 2.6.24-6~etchnhalf.9etch1. We recommend that you upgrade your linux-2.6.24 packages.