The server the api is hosted on was not responding properly. Skywing was probably rebooting it or upgrading it or something.
Incidentally, there's also http://nwn.entropywi...stnwns2html.cgi
and
http://neverlist.nwn...2.fr/list/NWN2 (in french, but it's pretty obvious)
and
http://yourserverlis...rt=&ord=players
They all get from the same place.
nwnlist not listing the nwn1 servers is probably due to an invalid character causing the list display to break on that website, rather than an issue with the listing api, as the alternatives list nwn1 servers. That issue remains.