I just changed DNS to point to the new IP, so if you tried recently it might take another hour or so before your DNS cache expires the bad entry for nntp.perl.org. The web interface is working and didn't change IP.
The tinderbox is still down. We have a plan for setting it up, but we are waiting for something to be able to (more on that later). Don't expect it back until sometime in the middle of next week. We'd like to host it but not maintain it too actively (as it has been in the past), so it's not entirely in our control. :-)