You have a patch update loop going on right now

Getting kicked back to the client when trying to go to the test server with this message.

A new patch for Diablo III is available. The game will now close and apply the patch automatically. You will be able to continue playing after the patch has been applied.

So we apply a new patch and it just repeats. Even reinstalling won’t fix it. Or a restart.

Edit: Fixed. Thanks for the quick fix.