The following error code occurs when enable the 3CX Instance Management: install-instance-manager returned error code 255

How to solve

switch to root user and input following command:

After entering the command, you can see the following information:

After that, we could enable instance manager in 3CX management console. When enabled this option, you can check the instance information in the 3CX cusomter portal.


💡:3CX will enable instance management after v16 update 6. You can also try to run this command to fix the problem if installing the latest version of 3CX fails.