To help address some of the questions I've seen posted on this forum, I wanted to provide a quick explanation of the technical issues experienced by players last night and this morning:
Last night, our authentication service (the step that verifies your account information whenever you log in) encountered an issue which resulted in some players being unable connect to Battle.net. This issue affected logins for Diablo III, StarCraft II, and World of Warcraft, as well as Battle.net Account Management and our official forums until approximately 11:30 p.m. PDT yesterday evening.
We then experienced another issue this morning with our authentication service that impacted most players' ability to log in to our games. That issue was resolved at approximately 10:30 a.m. PDT, and at this time players should be able to connect to Diablo III, Battle.net Account Management, and the forums without any problems.
If you are continuing to experience issues with login, please let us know in this thread. Before you do, though, we ask that review our Diablo III Support Page and Technical Support forum first to make the issue isn’t client-side or a known error.
Thank you in advance for your reports!