Remote access only working on one device

I’m using Hassio on a Rpi3 and have configured DuckDNS for remote access. It’s all working fine on my phone but my laptop doesn’t seem to be able to connect. I get the loading screen but then it just fails to load.

I’ve searched the forums but can’t find anything. Anyone experienced something like this?

I have a working setup with DuckDNS. https://[my-domain].duckdns.org. I’ve tried appending with the port 8123 but they just nothing at all happens.

If I try access from an incognito tab on my phone I have to append the port for it to work, but my laptop just loads until nothing happens. So phone needs port, but not laptop. Wierd.

I really believe it’s just something that I’m missing, but I can’t see what.

Try clearing your cache.

Try a different browser.

I’ve tried Chrome, Firefox and Safari. All with and without Incognito tabs.