ButterCup Firefox - No auth for my Nextcloud, but work with others

Hello the team and community,

I have a strange problem with the ButterCup Firefox extension.
I cannot log into my vault anymore, i can’t reach my nextcloud server from the Nextcloud Add link or the Webdav one.

When i want to connect to my server ButterCup give me a 401 Unauthorized error (Nginx too) and when i want to connect to another Nextcloud with the same config (Nginx - HTTP 2.0 - fpm - redis etc…) it works…

I deleted my BruteForce attemps list, rebooted everything, nothing work…

Here is my log in Nginx :
192.168.10.XX - USERNAME [05/Sep/2018:10:23:14 +0200] "PROPFIND /remote.php/webdav HTTP/2.0" 401 222 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:61.0) Gecko/20100101 Firefox/61.0" "-" "cloud.domain.fr" sn="cloud.domain.fr" rt=0.033 ua="unix:/run/php/php7.2-fpm.sock" us="401" ut="0.036" ul="245" cs=-

This is strange because my Windows 10 Webdav shared folder works when i want to use WebDav with the same user. I don’t have 2FA on those tests.

NC version 13.0.6
Php 7.2
Nginx 1.15