[TROUBLESHOOTING]: Trying to setup cosmos on a IPv6 only VPS

[tarbib]

What happened?

I am trying to setup cosmos on a ipv6 only VPS. I choose all defaults like generate self signed certificate.
I can go all the way to the "Apply and restart" button but I get :
"Bad Request: Invalid hostname. Use your domain instead of your IP to access your server. Check logs if more details are needed."

What should have happened?

I should have seen the cosmos UI.

How to reproduce the bug?

1. Go to https://[ipv6]
2. See error :
   "Bad Request: Invalid hostname. Use your domain instead of your IP to access your server. Check logs if more details are needed."

Relevant log output

2023/12/27 21:29:47 [ERROR] Port bc8 is added to a URL but it is not available. Skipping for now : 
2023/12/27 21:30:51 [ERROR] Invalid Hostname [2001:bc8:XXX:XXXX:XXXX:XX:XXXX:3009] for request. Expecting one of [2001:bc8:XXX:XXXX:XXXX:XX:XXXX:3009] :

Other details

I configured IPv6 as follow:
https://docs.docker.com/config/daemon/ipv6/#use-ipv6-for-the-default-bridge-network

System details

• OS: Ubuntu 22
• Firefox