Same here. This happens after character selection screen. Exact error message:
The game client is unable to gain access to the log-in server at this time. This is most commonly caused by firewall or router settings, security applications, or connecting through a campus network. For additional support, please visit http://support.guildwars2.com (Code=42:5:7:1008:101)
Was in the middle of a game and got booted out, sounds like a server crashed.
UPDATE: logged into another character and it worked. Then went to the original one that it crashed with and it worked but I lost some progress (got moved back to where I was earlier). Odd….