Problem with SSL!!

[TGates]

The problem is that you do not have a port forward for the domain. You need to have a vhost entry for the non-SSL version also (on port 80).
You did not mention which tutorial you used to setup your SSL, but that is the reason.
You can fix this (depending on which tutorial for SSL you used) by doing the following:

1. Go to: Admin > Module Admin > Apache Config > Override a VirtualHost setting > [select domain]
   
2. Port Override: 443
   
3. Forward Port 80 to Overriden Port: (checked)
   
4. Save and wait for the daemon to run.
   

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Is there a way, to go back to the way it was at the beginning, deactivating SSL?. When I try to disable SSL with the sudo a2dismod command, the page does not load.

Disabling SSL will NOT solve your problem! You need to REVERSE any configuration changes you made.