The remote host is missing an update as announced via advisory SSA:2006-129-01.

https://secure1.securityspace.com/smysecure/catid.html?in=SSA:2006-129-01

New Apache packages are available for Slackware 8.1, 9.0, 9.1, 10.0, 10.1, 10.2, and -current to fix security issues. More details about the issues may be found in the Common Vulnerabilities and Exposures (CVE) database: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-3352 In addition, new mod_ssl packages for Apache 1.3.35 are available for all of these versions of Slackware, and new versions of PHP are available for Slackware -current. These additional packages do not fix security issues, but may be required on your system depending on your Apache setup. One more note about this round of updates: the packages have been given build versions that indicate which version of Slackware they are meant to patch, such as -1_slack8.1, or -1_slack9.0, etc. This should help to avoid some of the issues with automatic upgrade tools by providing a unique package name when the same fix is deployed across multiple Slackware versions. Only patches applied to -current will have the simple build number, such as -1.