When I attempt to connect to any grain, I get a "303 See Other" response like the following one:

https://ui-longhexadecimalgrainsubsubdomain.mysubdomain.sandcats.io/_sandstorm-init?sessionid=1234567890ABCDEF1234567890ABCDEF1234567890ABCDEF&path=/
The location is then set to: "/"

This then redirects to the base URL:

https://ui-longhexadecimalgrainsubsubdomain.mysubdomain.sandcats.io/

This URL then fails to load. In Chrome, the iframe says "ui-longhexadecimalgrainsubsubdomain.mysubdomain.sandcats.io didn’t send any data."

This happens for every app and grain I have attempted to use. I'm using a cloud VPS on Ubuntu 24.04 with ports 22, 80 and 443 open. I can see soem errors in the sandstorm log file which I have attached.

sandstorm.log