Migration to bullseye succed but bad request error in web

hello :slight_smile:
Just finished the migration to bullseye. The migration do not show meaningful errors (2022-11-14 18:46:47,843: INFO - Exécution de la migration 0021_migrate_to_bullse - Pastebin.com and 2022-11-14 19:33:39,738: INFO - + Préparation du dépaquetage de .../libacl1_2.2. - Pastebin.com). The system is updated.

But I can’t access the server in the web interface I got 400 Bad Request.

Nginx log on the reverse proxy :
- - [14/Nov/2022:21:55:12 +0000] "GET /favicon.ico HTTP/2.0" 400 150 "https://gafamfree.party/" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.36"

I looked every log and nothing is trigered when I tried to load the main web page

the problem came drom ipv6 configuration. I had to change my dns recaord to enter the correct ipv6 adress so I can ping succefully and acces the web interface

well actually the problem is back again…
seems like ipv4 request fails but ipv6 succed…But idk how to resolve this

So I didn’t understood that ipv6 adress where directly connected to the internet. So I had to change the dns entries for my subdomains directly with their ipv6 adress on ovh. And set the main yunohost domain to its global ipv6 adress

thx to : Yunohost, Freebox et IPv6 - Le blog de Genma