Hi Jorghy,
Looks like during install, the terminal got created wrongly. I have seen this kind of issues when there is name resolution issue with system. During install, the terminal got created either by short name or IP and communication happening exactly opposite to what created. If root user cannot do anything then only way is to login as root to system, make changes to system so that SC services will not start on reboot. Reboot the system. After reboot you can do 'selang -l'. Make the necessary changes to default local terminal so that after reboot you can selang as well as start/stop services.
Regards,
Pravin Bhole