503 error when installed on subdomain

[gisforgabriel]

I am getting a 503 error when trying to use minigalnano.example.com rather than example.com/minigalnano to host an instance of MinigalNano. I have other PHP applications running on other subdomains on the same server with the same root domain, which are set up identically. The very same instance, with the very same files, runs fine as a directory.

I feel like I'm missing something obvious, but can't see what it is. Can anyone help?

[nodiscc]

What server/version? What does your web server's error log say?

[gisforgabriel]

The server is running Ubuntu 14.04, Apache2. I set up an error log for the virtualhost, but it is empty so I assume there is no issue there.

<Virtualhost *:80>
  ServerName minigalnano.example.com
  ServerAlias minigalnano.example.com
  DocumentRoot /var/www/minigalnano
 ErrorLog logs/minigalnano-error_log

   <Directory "/var/www/minigal">
        RewriteEngine On
        Options +FollowSymLinks +Indexes
        AllowOverride All
    </Directory>

</Virtualhost>

However I've also set the general Apache log level to debug and it's not showing anything, so I assume something isn't right in Apache - I just don't know where to look.

[nodiscc]

@gisforgabriel you may have to tweak your PHP error reporting settings:

https://stackoverflow.com/questions/1053424/how-do-i-get-php-errors-to-display

Are you able to display errors this way?