Nostalrius Begins - Quality wow vanilla realm (1.12)

As of today, after the patch update I assume, I'm getting the message "Disconnected from server" as soon as I press the login button. Seeing the server is online https://en.nostalrius.org/#dashboard I'm here wondering what is the issue behind this as I haven't made any changes on my PC as of late. On the login screen it shows I'm at the Test Realm - IsVV2 if that could be the issue but since I can't even reach it to the server list I can't change that. I tried deleting WDB folder, running as an administrator but nothing worked. Any help is appreciated

Disregard this thread, turns out the problem was the server I was set on by accident. Changed the realm name inside a config and worked like a charm.