I don't know exactly if this is an OS issue or a game issue, but it's kinda annoying.
Firewall issues in OS X Mavericks
Could you possibly have any recommendations?
Just disable it.
Edit: This is an issue by Blizzard, not by OS X.
- Trusting router firmware. Really?
- Coffee shops and public wifi (most mac users have laptops I am guessing)
- Applications that listen on ports for no good reason and may be vulnerable
Firewalls are not optional these days, they are the basics of security, and there is a reason they are on by default in Windows.
Btw this issue is still not fixed in 10.11.4
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