Microsoft Product Activation server reachability

[Nathan Anderson <nathana () fsr com>]

Anybody else having a problem reaching (what appears to be) the sole Microsoft Product Activation server 
(wpa.one.microsoft.com)?

$ ping wpa.one.microsoft.com
PING wpa.one.microsoft.com (94.245.126.107): 56 data bytes
36 bytes from 213.199.189.41: Communication prohibited by filter

I get this sourcing from our network, from AT&T 3G, and from ye residential DSL connection located in the greater 
Seattle area. They aren't simply source-filtering. Either that or they are source-filtering for 0.0.0.0/0.

This is apparently the only server/IP they have set up to respond to these requests. wpa.one.microsoft.com resolves to 
that IP via every DNS server I've tried (so no round-robin A records), Microsoft products that need to activate over 
the internet only try to resolve that FQDN, and I've looked for others without success (wpa.two.microsoft.com isn't 
valid, for example).

-- 
Nathan Anderson
First Step Internet, LLC
nathana () fsr com