U2 is also down btw if anyone is wondering.

Edit: To clarify, just like other Chinese-based trackers, it's only down if you hadn't log in ever since the problem started, if you are still logged in, DO NOT LOG OUT, DO NOT CLEAR CACHE, and DO NOT CHANGE YOUR BROWSER. That way, you should be able to use the tracker normally.

I have problem with U2 as well. I did not aware about this. I cleaned up my PC and erased all the cookies. ADC is down, now I cant access U2 also. Oh no... I hope this will fixed soon.