When launching the 4D application (e.g., v20.3), some users may encounter the following error message:

• Error -10002: Connection interruption for this process or the connection could not be established.


• Error 65: No route to host.

This issue appears on some workstations only, while others are unaffected.

This behavior may be related to macOS's built-in firewall, which may be blocking 4D's network traffic. To resolve it:

1. Click on the Apple menu > System Settings.


2. Click on Options.


3. Check whether the 4D application is listed.


4. If it is not listed, click “+” and manually add the application /Applications/


5. Ensure that the status is set to “Allow incoming connections”.