I have been looking for this for hours now but can't find how I can unbind the slave server and install the control pannel on this server.
A slave server does not contain all data in it's database, so there is data missing to run it as standalone server. What you might try is that you backup the dbispconfig database of this slave server, then copy over the whole database of the master server, then change the master host name in the interface and server config.inc.php file of the slave to be empty: $conf['dbmaster_host'] = ''; and then enable the ispconfig vhost in the apache / nginx sites-enabled folder. Finally you can login into ispconfig on the slave and delete all websites, email domains and dns zones of the other servers (probably you have to cleanup the sys_datalog afterwards by removing all lines where server_id != 0 and != the local server_id of this slave.
