The remote host is missing an update as announced via advisory SSA:2005-310-04.

https://secure1.securityspace.com/smysecure/catid.html?in=SSA:2005-310-04

New apache packages are available for Slackware 8.1, 9.0, 9.1, 10.0, 10.1, 10.2, and -current to fix potential security issues: * If a request contains both Transfer-Encoding and Content-Length headers, remove the Content-Length, mitigating some HTTP Request Splitting/Spoofing attacks. * Added TraceEnable [on/off/extended] per-server directive to alter the behavior of the TRACE method. It's hard to say how much real-world impact these have, as there's no more information about that in the announcement. The original Apache announement can be read here: http://www.apache.org/dist/httpd/Announcement1.3.html Note that if you use mod_ssl, you will also need a new mod_ssl package. These have been provided for the same releases of Slackware.