*** This post is intended for people with some basic technical expertise ***
The facts:
1. Waerth has posted this http://img151.imageshack.us/img151/8069/stillblocked1cv4.jpg as "evidence". Everyone, at any place in the world, can find lists of open proxies that have been blocked on nl:w: (see http://nl.wikipedia.org/wiki/Categorie:Wikipedia:Open_proxies). An IP can be picked from those lists and any browser can be configured to use that number as proxy. The port is not published, but some ports could be obvious and after some trial and error one could find a working combination. Regardless the geo location of the IP tried as proxy. Make the screenshot and here you are.
2. Waerth has disclosed in the Dutch village pump this list http://nl.wikipedia.org/wiki/Wikipedia:Lijst_van_geblokkeerde_exit_servers to be my source for blocking "the whole of Thailand". However, this page lists the exit nodes of cascaded open proxies as these are discovered by my scanning program and is generated automatically. Besides the blocking of these exit nodes is done by a bot with a standard phrase in the remark field. The readable text is "Open proxy - Nadere informatie". The clickable part brings you to: http://nl.wikipedia.org/wiki/Wikipedia:Blockreason3 3. The screenshot above is NOT the result of being blocked by one of the exit nodes as referred to in 2 (btw a similar mechanism is used when auto-blocking TOR exit nodes, obviously with slightly different text), but the result of a manual block of a (normal) open proxy. Such type of open proxies are only blocked in the case of noticed vandalism of any kind.
4. From a mail sent this morning by Waerth to various people, I have derived the originating IP. This IP is currently not and has never been blocked in the past (except maybe autoblocks). Some weeks ago I've spent considerable time to figure out what IP's could possibly be used by Waerth's provider as a cache. One such IP has been unblocked then as a precaution, although it was very unlikely this one could be the source of any trouble.
For more reading on this topic in general, see http://nl.wikipedia.org/wiki/Gebruiker:RonaldB/Open_proxy_fighting (in English).
Rgds Ronald