MyChat Client error #0231: port "XXX" for the service "NNN" is already occupied by another running application
Error
Error #0231: port "XXX" for the service "NNN" is already occupied by another running application
Error description
You can't use this port as it was taken by another network application (not MyChat Server).
Problem solution
Usually all ports less than 1024 are not recommended to use as they can be occupied by various popular network services. Besides, the port you choose can be busy by some working application. Choose another free port and save the settings again.
See also
What network ports MyChat Server uses?
A list of network ports that are used by popular applications