Just to clarify any language mis-interpretations
What kurgans is trying to say is that, in the debian way of setting up apache, the configuration "files" in /etc/apache2/sites-enabled should
never actually be files, but symlinks to the real ones which are stored in /etc/apache2/sites-available.
Therefore, replacing the IP in /etc/apache2/sites-available/* should be enough unless you have a misconfigured system (which was your case BioALIEN).
As a side note, the great thing about this "debian way" of setting up apache is that you can easily enable or disable any configuration file with a simple command:
Code:
a2ensite ispcp.conf // This enables ispcp.conf by creating a symlink to sites-available/ispcp.conf
a2dissite ispcp.conf // This removes the symlink, effectively disabling the site