If an instance of Bitnami (Wordpress, Prestashop) is timing out, verify if the services are running:
sudo service --status-all
You should see the bitnami service on:
[+] bitnami
Try to restart this:
sudo service bitnami restart
If it does not work, then run the ctlscript.sh:
sudo /opt/bitnami/ctlscript.sh status
You'll see three options: [mysql, php-fpm, apache]. In my case I did not have success in restarting mysql, so I forced a quit by searching the PID and then killing it:
> sudo pgrep mysql
< 123
> sudo kill -9 123
And finally could start it again and make the instance available again. This was done with a testing ISO and did not care about potential loss of data, avoid this approach on live systems.