We're aware of an issue affecting our GTAC Knowledge site. A large number of articles aren't working properly.
This is being investigated currently and we hope to have this resolved as soon as possible.
We'll share updates here as they are available - and as long as I'm awake
Meanwhile, The Hub is up and working - feel free to share your questions here!
Edit - 10:12PM EST: The site seems to be working again now. If you have trouble, please let us know here.
Edit - 4:50PM EST 3/1/16: A new problem has appeared... we're working on it.
Edit - 5:01PM EST 3/1/16: Resolved.