The remote host is missing an update to ident2 announced via advisory DSA 494-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%20494-1

Jack <jack@rapturesecurity.org> discovered a buffer overflow in ident2, an implementation of the ident protocol (RFC1413), where a buffer in the child_service function was slightly too small to hold all of the data which could be written into it. This vulnerability could be exploited by a remote attacker to execute arbitrary code with the privileges of the ident2 daemon (by default, the 'identd' user). For the current stable distribution (woody) this problem has been fixed in version 1.03-3woody1. For the unstable distribution (sid), this problem will be fixed soon. We recommend that you update your ident2 package.