Firstly I can no longer access my HA dashboard. I suspect this may have something to do with moving the nameserver from Godaddy to Siteground for website building purposes.
However I now want to change the domain from <ha.original-domain.com/503> to <ha.new-domain.com/503>
Can this be done without having access to HA dashboard? It was so long ago when I originally set this up I can’t remember what I did.
You should still be able to access it locally, using the LAN IP, for example
https://192.168.0.42:8123
You need https there if you’re doing SSL directly in HA (no proxy server), and you’ll have to click through the warning.
You can remove SSL by reconfiguring the http integration - removing the ssl_* lines and restarting HA. Then you can get new SSL certificates for the new domain and set it up again.