Hallo zusammen,
Dev-Info: Hi everyone, thank you for reporting the issue about the firewall not working after the update. We are really sorry for the trouble caused by this. We have been working on this issue for the past 48 hours. With the help of some of you, who provided us with their logs, we've been able to identify the problem. In the code that reads the application rules, we had a bug. Whenever the rules file contained application from nonexisting disk (either old volumes or removable disks that are not connected at the moment), the firewall driver failed to load.
We have fixed the issue now and have released the fix as an emergency update. It should automatically download during the installation and also to the existing installations. You can check the fixed version of the driver: aswnethub.sys - 20.2.55.0 Restart is needed for the new driver to be active.
We are really sorry about this and thank you all for your patience. Lukas.