How to configure your Mac Firewall for file sharing
If you have confirmed that folders are shared properly but you still cannot connect, then the MacOSX firewall may be blocking the network.
Use the following steps to navigate to the firewall control screen.
- Open System Preferences and click "Security".
- Click "Firewall".
- Click the lock to make changes.
- Click "Advanced...".
- Ensure that "Block all incoming connections" is unchecked.