well im pretty sure it has smth to do with the Internet settings at work.
Cause red Server is working if i connect via Phone Hotspot.
Edit:
Problem solved, Firewall settings blocking any Internet connection for a programm which is not in the list.
Edit 2:
Okay problem not solved, added PRO_64_94 to the list of allowed Programms in the Firewall settings.
Still can't connect to any server. There must be anything else which needs to be allowed too.