Airdrop not working with firewall on
For a long time the airdrop on my mac was only working when I turned off the firewall if I needed to use it.
I tried all the troubleshooting (turning bluetooth and wifi of the used devices off and on again, restarting the devices, unchecking the upper most checkbox on the further firewall options,...). Nothing seemed to help.
I found the same question on this forum but couldn't answer it, so I am posting the question again and giving myself the solution to it I guess (if anyone else struggles with this in the future).
Cheers
MacBook Air 13″, macOS 11.3