@girish I did not know the term. I certainly did know the effect ^^ (I might have to invest in an actual rubber duck... maybe they are especially effective)

You can close this topic. -.- I realized that homeassistant is limited to IPv4 support actually. =/

@JOduMonT Currently, Cloudron does not support IPv6 and requires an IPv4. You can, of course, configure your server to have IPv6 address additionally and configure DNS AAAA records manually and that should work. Goes without saying, we want to add IPv6 support at some point (I know it's 2020!! )