Can't use app/site remotely anymore

Configuration
1

For some reason I can’t use the iOS app or browse to my HA remotely anymore.
Internally it’s fine but when I’m off Wi-Fi over the internet it fails.

In the App I see “An SSL error has occurred and a secure connection to the server cannot be made” NSURLErrorDomain - 1200

The server “url” did not accept the certificate
NSURLErrorDomain - 1205

From Safari I get “Safari can’t open the page because it couldn’t establish a secure connection to the server”
I got the same from a work PC using Edge.

I use the DuckDNS add-on with lets encrypt etc
The only change recently was a backup/restore from a Pi to a box inside Proxmox.

DuckDNS isn’t giving me any errors in the addon log.
When internal the cert looks ok.

I have a port forward which hasn’t changed and the IP of HAOS hasn’t changed either.
A quick port checker says the port is open etc

Any ideas where I can start troubleshooting?

2

From a quick poke around I think this is down to my phone network provider o2 in the UK blocking duckdns, if you go to www.duckdns.org you get an access denied error.

3

Yeah, with a VPN running on my phone it works fine.
Not sure why O2 have decided to totally block duckdns :frowning:

4

Moved my URL etc to Cloudflare and the addon , works fine now :+1: