#NSURLErrorDomain - 1003 in companion app on iOS

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rare nova
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I have set up DuckDNS for my HA installation, both for internal and external access. I use https://xxx.ducdns.org:8123. I can use this URL fine both on my Mac and iPhone (Chorme and Safari). However launching the Companion app using https://xxx.ducdns.org:8123 both for internal and external access basically only works from the 5G net on my iPhone, and occationally when connected to WiFi at home. Accessing https://xxx.ducdns.org:8123 directly in Safari or Chrome from my iPhone works every time. I have also tested using either Chrome or Safari as brower in settings within the Companion app. No success.

I am struggeling finding what could be wrong here. Any pointers is highly apprecieated 🙂

covert wedge
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Perhaps you find something here: https://community.home-assistant.io/t/cant-log-into-ha-app-on-ios-nsurlerrordomain-1003/373835/4

in short there seems to be a DNS resolution issue

Home Assistant Community
Can't log into HA App on iOS - NSURLErrorDomain -1003

I can open home assistant using web browser with no issues. I can login both locally and via the https://homeassistant.example.com. It’s just the iOS app that is throwing error being connected to the same Network via the same router as my laptop.