Looks to me as if the forum and Wiki have had an IP change, may be wrong but I can't remember 50.97.156.4 being used before? and it's not in the usual run of IP's I associate with N3V, normally it's 174.x.x.x or 173 I think?
Checking via a whois.
It's showing 50.97........ ISP as Softlayer whereas 174 is showing ISP as Theplanet.com both on softlayers Domain though.
Softlayer is according to some sources is now the largest Host on the planet and as it now belongs to IBM, probably means things will get worse........ Bigger does not equal better in my book.