Step by step:
Quote:Yesterday I've tried to add a domain and also an alias domain. Both of them have remained unsuccessfully created (red sign, not green status).
You should try to discover why they failed instead of simply deleting/recreating them. The corresponding error message can be seen (at least) using PMA, going to the "domains" or "domain_aliasses" tables and seeing the message that's left in the status field of the corresponding domain/alias.
If you think it's temporary, go to the panel as admin, tools, ispcp debugger, and re-request the addition from there.
Quote:but any kind of PHP script I try to use in this account, it gives me a 500 "Internal server error". I've thought that the user/group in the sequence added to ispcp.conf is different from the real user/group, but the problem seems to be in another place. Any suggestion is appreciated.
See the /var/log/apache2/suexec.log, where user/permissions problems about fastcgi are being logged. It should give you the hint you need to solve it (or paste the logs here if you can't figure out what's wrong and we'll try to help).