Cant load Supervisor screen or Node Red Screen

Configuration
1

Hi,

I’m running core-2021.5.5 and cant load the Supervisor screens or Node-Red screens. I changed my router earlier this week, but its inherited most of the settings from the old one.

Not sure where to start to diagnose this.

I’m not an expert in this, i’ve only been using Home Assistant for a few months.

Thanks
Paul

Update: Cant load file editor either, HACS.