The solution is to turn off the built-in macOS firewall in network settings, then it works again with no problems.
After that you can run LuLu as its a much better firewall: Objective-See: LuLu
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The solution is to turn off the built-in macOS firewall in network settings, then it works again with no problems.
After that you can run LuLu as its a much better firewall: Objective-See: LuLu