I'm having the exact same issue. It seems to be connected to the current server congestion problems caused by the recent influx of new players and the measures being tested to counter the unexpected spike in connections.
Funny enough, i have the same ISP as someone who posted in this thread (Vodafone, Berlin) and im also on the same data centre. Seems to be a mixture of ISP and datacenter. I sincerely hope it gets fixed soon, because sitting 30 minutes in front of the PC not knowing if the next attempt to login is a successful one, isnt fun at all.