I tend to be more in favour of Stijn idea with regards to blocking the number of games hosted per IP, perhaps even as low as one or two, then special things like the Zeal Server can be let off that requirement (as it serves a purpose).

However, that will require either a network wrapper around the Epic List Server that monitors connections to the listing port, and only allows one or two concurrent per IP. Or for BlurredD or another programmer from the community working on attaching the feature to the Epic's List server tool. Either of those are good, but are time consuming. I couldn't work on them myself until University finishes (in a couple of months) however I would have nothing against another community members involvement in getting that done (and I'm sure the community would be thankful to that person).

With Stijn's idea, the list server can remain open to all, and that would be my preferable method of operation. Like he commented, its too small to have long winded processes to work on banning people and to be honest, the problem of abuse only seems to come along once every few years, the rest of the time the community respects the list server network and it gets good productive use.