@Braulio-Cesar-Holtz-Ribeiro you need to set the HTTP header for frame options on the site that is displayed inside the iframe. NodeBB actually has a setting for this in the ACP. You should be able to find it by searching "frame"

I managed to do the update, after correcting the nginx .conf for the test IP, I did not start the application, causing the Bad Gateway error. The forum works with Webview from version 1.1 Thank you for your help