Change control panel entry domain to sub

[joximu]

You should do a better research... but ok, you apologized... :-)

You change the admin-url in /etc/ispcp/ispcp.conf, in /etc/apache2/sites-enabled/00_master.conf and its copy in /etc/ispcp/apache/working/00_master.conf
restart apache and then you should be ok.

You can also use domain.tld but maybe it's necessary to reduce the possibilities of connecting to the normal domain.
Normally all *.domain.tld are accepted (ServerAlias) - this may interfere with admin.domain.tld - so you need to change some ServerAlias in /etc/apache2/sites-enabled/ispcp.conf after creating the domain.tld in ispcp (and dont' forget the working copy in the other place...).
Maybe it works without any change...

/Joximu