Hello Kevin!
Thank you very much, but it's still not working....



## odoo backend ##
upstream odoo {
server 127.0.0.1:8069;
}

## http redirects to https ##
server {
listen 80;
server_name *.XXXXX.ch www.XXXXX.ch XXXXX.ch;
return 301 https://$server_name$request_uri;
}



## https site##
server {
listen 443 default;
server_name *.XXXXX.ch XXXXX.ch www.XXXXX.ch;
# root /usr/share/nginx/html;
# index index.html index.htm;

# log files
access_log /var/log/nginx/odoo-access.log;
error_log /var/log/nginx/odoo-error.log;

# ssl files
ssl on;
ssl_certificate /etc/letsencrypt/live/XXXXX.ch/fullchain.pem;
ssl_certificate_key /etc/letsencrypt/live/XXXXX.ch/privkey.pem;
keepalive_timeout 60;

# limit ciphers
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_prefer_server_ciphers on;
ssl_ciphers AES256+EECDH:AES256+EDH:!aNULL;


# proxy buffers
proxy_buffers 16 64k;
proxy_buffer_size 128k;

## default location ##
location / {
proxy_pass http://odoo;
# force timeouts if the backend dies
proxy_next_upstream error timeout invalid_header http_500 http_502 http_503 http_504;
proxy_redirect off;

# set headers
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto https;
}

# cache some static data in memory for 60mins
location ~* /web/static/ {
proxy_cache_valid 200 60m;
proxy_buffering on;
expires 864000;
proxy_pass http://odoo;
}
}