SSL Config

When enabling ssl using a certificate authority, the config file gets copied to the wrong file. in hooks/upgrade-charm line 310.

The line reads as follow:
  with open('/etc/apache2/sites-available/default-ssl', 'w') as f:

and it should be like this:

  with open('/etc/apache2/sites-available/default-ssl.conf', 'w') as f:

this causes apache not to load the right config when using SSL with a CA.