open_basedir problem !

[joximu]

for every domain there are php.ini files situated under
/var/www/fcgi/<domain>/php4|5/php.ini
domain "master" is ispcp itself.

I think you should find the right php.ini in:
/var/www/fcgi/boshosting.net/php4/php.ini
and there is a line open_basedir...
(after commenting, restart apache)