External Sites App (Snap)

Any one have any issued running a java based web app in external sites? I am attempting to run Apache Guacamole that is stored on another server. When clicking the tab for the website in NextCloud, I am returned with a blank white screen. The URL is good as it can be accessed on the same system I am accessing Nextcloud Web UI via FireFox, Edge, and internet explorer.

Afaik, an external website is usually embedded in an iframe if you use the External Sites app. It might be possible that your Guacamole software doesn’t allow this by default (similar as if you try to show Nextcloud in an iframe, which doesn’t work.) Check the log files of the Guacamole software for any root cause of the problem).