Rails 5, and distro-packaged Passenger and Apache on Debian 8

I've been attempting to set up a Linode server for a Rails app (a modern one), using Debian 8. I tried to follow this tutorial and, no dice.

Here is what I've done so far:

• Install the latest ruby systemwide

• Install bundler, gem, etc systemwide

• Install all gem dependencies for my app system-wide

• Checked permissions on my directories

• Added the "directory" stuff mentioned here.

If it matters, I must have a subdomain, those are how my certs are set up. Currently it's dev.sitenamehere.com. The other requirement is https:// , no port 80 here.

All I get is either a "The requested URL / was not found on this server", or if I set it up the multiple way, I get a 403.

I don't know why this is happening at all, there's no reason for it. Something has changed (I guess) to make this not work properly, and I can't find out exactly what changes.

Any ideas? I've been at this for 3 days now, and still have nothing to show for it.