I didn't know Baker had ported it to MacOS, well you learn something new every day
I would first try and do the obvious things like ensure there are no routers or firewalls blocking your access to the server and also make sure you have the latest stable build of your engine of choice.
You can also connect to a server by typing the appropriate command instead of going through the menu. Perhaps try going in to Console and typing the following:
Code:
Connect bigfoot.quake1.net
Kind regards
Monty
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