To resolve the issue:
- 

- Choose System Preferences from the Apple () menu. 

- Click Security & Privacy in the System Preferences window. 

- Click the Firewall tab in the Security & Privacy panel. 

- Click the lock icon at the bottom-left corner of the Firewall pane; authenticate with an administrator username and password. 

- Click the Firewall Options button. 

- Disable the checkbox for "Block all incoming connections." 

- Click the OK button. 

Learn more
If you have a Touch OSC control surface installed in Logic Pro X, then see Logic Remote may not connect if a Touch OSC device is already installed in Logic Pro for more information.