The remote host is missing an update to ajaxterm announced via advisory DSA 1994-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201994-1

It was discovered that ajaxterm, a web-based terminal, generates weak and predictable session IDs, which might be used to hijack a session or cause a denial of service attack on a system that uses ajaxterm. For the oldstable distribution (etch), the problem has been fixed in version 0.9-2+etch1. For the stable distribution (lenny), the problem has been fixed in version 0.10-2+lenny1. For the unstable distribution (sid), the problem has been fixed in version 0.10-5. We recommend that you upgrade your ajaxterm package.