I have been running the self-hosted server on a Synology NAS for a few months now and I was always able to access it from outside my home, without any port-forwards in my firewall. Since last week I had some issues with my NAS (almost full), but I solved that.
Now, I’m not able to access my Homey anymore from outside my LAN.
Any suggestions?
What happens when you access your Homey at https://yourcloudid.connect.athom.com/api/manager/system/ping? You can find your Cloud ID in the mobile app More->Settings->General
Apparently there was an issue with my NAS. After I solved it, Homey was accessible both from home and remote. Thanks for the suggestion Sven.
What is issue would be nice to know 
