Hi ALexS, I have the same ploblem,I running egroupware in to a docker container , this is my nginx.conf
user nginx;
worker_processes auto;

error_log /var/log/nginx/error.log warn;
pid /var/run/nginx.pid;

events {
worker_connections 1024;
}

http {
include /etc/nginx/mime.types;
default_type application/octet-stream;

log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                  '$status $body_bytes_sent "$http_referer" '
                  '"$http_user_agent" "$http_x_forwarded_for"';

access_log  /var/log/nginx/access.log  main;

sendfile        on;
#tcp_nopush     on;

keepalive_timeout  65;

#gzip  on;

include /etc/nginx/conf.d/*.conf;

where I insert the code you wrote ?
Tks
Pep

Hello everyone,
I’m sorry to return to this issue but I need to know if anyone has any news related to the preview problem and file down load. Even with version 3.15.0 the problem appears the same.
.
File downloading does not work either. The downloaded file appears to be corrupted.

image.png1044x318 9.43 KB

Hi , Ralf this is the content of my /etc/egroupware-rocketchat/nginx.conf

# Rocket.Chat sniplet meant to be included in server block of EGroupware vhost

        # proxy into rocketchat container
        location /rocketchat {
                proxy_pass http://127.0.0.1:3000;
                include proxy_params;
                proxy_set_header Upgrade $http_upgrade;
                proxy_set_header Connection "upgrade";
        }

and

RewriteEngine On
RewriteCond %{HTTP:Upgrade} =websocket [NC]
RewriteRule ^/rocketchat/(.*) ws://127.0.0.1:3000/rocketchat/$1 [P,L]
RewriteCond %{HTTP:Upgrade} !=websocket [NC]
RewriteRule ^/rocketchat/(.*) http://127.0.0.1:3000/rocketchat/$1 [P,L]

is the content of my /etc/egroupware-rocketchat/apache.conf, the server and the container are updated at the stable version.
Can you help me to resolve the same “retry” error?
Tks