Here is what the Re-Check configuration reports now. It has changed considerably:
The status of your system is being checked to ensure that all enabled features are available, that the mail server is properly configured, and that quotas are active …
Your system has 3.87 GiB of memory, which is at or above the Virtualmin recommended minimum of 256 MiB.
BIND DNS server is installed, and the system is configured to use it.
Mail server Postfix is installed and configured.
Postfix can support per-domain outgoing IP addresses, but is not currently configured to do so. This can be setup in the Postfix Mailserver module.
I clicked on that link, but all it provides is a way to edit a file, which I have no clue how to do or even if it’s necessary.
The following PHP versions are available : 5.6.40 (/usr/bin/php5-cgi)
The following PHP execution modes are available : cgi
The following PHP-FPM versions are available on this system : 5.6.33 (php5-fpm)
PHP versions have changed to 5 since last check. Regenerating any missing php.ini files.
ProFTPD is installed.
Logrotate is installed.
SpamAssassin and Procmail are installed and configured for use.
ClamAV is installed and assumed to be running.
Plugin Nginx PHP-FPM website is installed OK.
Using network interface eth0 for virtual IPs.
IPv6 addresses are available, using interface eth0.
Virtualmin could not work out the default IPv4 address for virtual servers on your system. You will need to update either the Network interface for virtual addresses or Default virtual server IP address fields on the module configuration page.
… your system is not ready for use by Virtualmin.
Totally lost on how to resolve this.