Update: domain issues resolved.  You should be able to login without a problem now.

Unfortunately, some players are still experiencing the problem.  This appears to be due to delays inherent in propagation of domain addresses.  While the vast majority of players have access, some aren't able to get in.  We apologize for this.  It should resolve itself soon as the information propagates further.

Original post:

Due to some issues with the playnet.com domain, our auth server is inaccessible for the moment.

We've resolved the issue but were told that it might take a few hours to update.

Apologies for the inconvenienece.