I would like to make a proposition for assistance.
I would like to install whmcs on its own server running nethserver, while making use of all the strong features that nethserver has to offer, including the builtin database and vhost.
limit by ip, etc.
the installation would be made on preferably a subdomain…
WHMCS has become a tool that most people doing online business require in order to handle their billing needs. and I know many would appreciate an even simpler way to install on a dedicated server/VPS.
also configuring cron jobs to work correctly,
and setting up the security setps as defined on their site.