A few days ago, after installing Virtualmin, I noticed that the main website of my host was not working. (i.e. host.mydomain.com). I was getting 403 Forbidden errors. After hours of troubleshooting, I started over, verifying how long it took before it stopped working and the 403 errors continued.
I have a fresh install of Ubuntu 16.04. I installed Virtualmin. I configured Virtualmin. During this time, I was able to get to http://host.mydomain.com
As soon as I created my first virtual host (which Virtualmin did successfully), I was unable to get to http://host.mydomain.com. I am getting 403 errors again.
It does not look like any of the files in /var/www or /var/www/html had changed in file size or permissions.
When I delete that virtual host, I am able to access the main site at http://host.mydomain.com again.
Note that I have installed this same configuration dozens of times, though not in the last 3-4 months and never had this problem.
Any ideas? Thanks in advance!