stuck on loading screen

Hi ! 

Here is what I see :

Everything was working fine before I rebooted my server computer and my public IP changed. 

Now, it's working with :

- locahost

- any connexion with a browser that didn't previously connected with my server (Ex : Edge instead of Chrome, another tablet, etc.)

It does not work with :

- my local IP on Chrome on the server.

- my new public IP on a remote tablet that previously connected with my server.

What I tried :

- restart the server

- delete cache on client browser

- delete cookies about my IP and ubooquity on client browser.

- deactivated the user setting on the server.

- checked the logs. Nothing special.

Any ideas ?