Thanks for the quick reply! I personally kinda forgot that I made this post until just now
@jfuruness When turning off Firewall completely, the problem persists.
@MostLostNoob Changing my standardbrowser did the trick.

When i try to authorize my client, i get this error message:
ERR_CONNECTION_REFUSED

PC/ Router have been restarted.
Exceptions to firewall have been added.

Any idea what to do? I am a bit out of ideas