The remote host is missing an update to mah-jong announced via advisory DSA 503-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%20503-1

A problem has been discovered in mah-jong, a variant of the original Mah-Jong game, that can be utilised to crash the game server after dereferencing a NULL pointer. This bug be exploited by any client that connects to the mah-jong server. For the stable distribution (woody) this problem has been fixed in version 1.4-3. For the unstable distribution (sid) this problem has been fixed in version 1.6.2-1. We recommend that you upgrade your mah-jong package.