Hi, sorry I was sick these days and now go back to the problem.
I now explain my situation:

My domain is https://mydomain.synology.me:2345, I have successfully completed all of your instructions. In the ubooquity.conf file I have replaced httpd-user with a user name with administrator rights on the Comics folder.

I when I launch the "start ubooquity" command I refer to the command line with the script:
ubooquity start / running, process "a 5 digit number" okay?

When launching ubooquity on the browser in the address bar write https://mydomain.synology.me:2202 or 2203 but in either case you will not find anything, this is because my synology is in another home. I confirm that you have opened both ports 2202 and 2203 on the router and synology.
One thing is not to understand how to check java instance, if you want to be able to explain how do I try it?
For the rest I do not know what else to tell you to help me

Hi, I apologize for the mistakes and thank you for the help.
I followed your guide step by step, but at the end at http: // NAS-IP: 2202, it does not open anything.
To be more precise my synology runs under https, do I have to do something different?
I would also like to use Ubooquity remotely so ip is a dynamic example:

https.//mio.synology.me:2345

Where am I wrong?

Thank you and sorry