The remote host is missing an update as announced via advisory SSA:2007-207-01.

https://secure1.securityspace.com/smysecure/catid.html?in=SSA:2007-207-01

New bind packages are available for Slackware 8.1, 9.0, 9.1, 10.0, 10.1, 10.2, 11.0, and 12.0 to fix security issues. The first issue which allows remote attackers to make recursive queries only affects Slackware 12.0. More details about this issue may be found in the Common Vulnerabilities and Exposures (CVE) database: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-2925 The second issue is the discovery that BIND9's query IDs are cryptographically weak. This issue affects the versions of BIND9 in all supported Slackware versions. More details about this issue may be found in the Common Vulnerabilities and Exposures (CVE) database: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-2926