Hi,
following some vandalism attempts, both Horizon and Toolsadmin are affected by a general Oauth issue in Wikitech which prevents from proper user authentication.
Affected URLs are: * https://horizon.wikimedia.org/ * https://toolsadmin.wikimedia.org/auth/login
Horizon is the web UI used to create and manage Cloud VPS. Toolsadmin (also known as striker) is the web UI used to create and maintain Toolforge accounts.
We have no estimation right now on when a fix will be available, but several people are actively involved in trying to get things back to normal.
regards