The remote host is missing an update to ikiwiki announced via advisory DSA 1553-2.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201553-2

The update of ikiwiki in DSA-1553-1 caused two regressions. An updated version of ikiwiki is available that fixes these problems. For reference, the full advisory text is below. It has been discovered that ikiwiki, a Wiki implementation, does not guard password and content changes against cross-site request forgery (CSRF) attacks. For the stable distribution (etch), this problem has been fixed in version 1.33.6. For the unstable distribution (sid), this problem has been fixed in version 2.42. We recommend that you upgrade your ikiwiki package.