#1 - Jan. 16, 2013, 2:22 p.m.
Blizzard Post
We’re aware that some players are having connection issues when attempting to log into the Public Test Realm. We’re investigating the issue with our QA and development teams to resolve the problem.

Please be aware that our Customer Support department cannot assist with issues pertaining to PTR access, or upgrading your current PTR account's status. If you have an open ticket we’d appreciate you closing it and waiting for further updates here regarding resolution of the issue.

Thank you all for the reports and for your patience.

Update - This includes the character locked issue that some players are encountering with PTR accounts of lower account levels.