Nextcloud behind nginx reverse proxy error on iPhone and iPad

When publishing a nextcloud website using a nginx reverse proxy, you might get an error shown on Apple iOS iPhone and iPadOS iPads on all browsers - e.g. Safari or Chrome: ERR_CONNECTION_CLOSED

Solution

Add in the nginx reverse proxy configuration the following line:

proxy_hide_header Upgrade;

http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_hide_header 

By default, nginx does not pass the header fields “Date”, “Server”, “X-Pad”, and “X-Accel-...” from the response of a proxied server to a client. The proxy_hide_header directive sets additional fields that will not be passed. If, on the contrary, the passing of fields needs to be permitted, the proxy_pass_header directive can be used.

Syntax:	proxy_hide_header field;
Default:	—
Context:	http, server, location

Nginx GUI configuration:

1. Login to your Nginx Proxy Manager.
2. Open the 3 dots settings menu of the NextCloud host and select “Edit”
3. In the tab menu at the top of the window that has just opened select “Advanced” and insert the following in the “Custom Nginx Configuration” box:
   

   proxy_hide_header Upgrade;

4. Click "save". 

 

Source: https://help.nextcloud.com/t/nextcloud-behind-nginx-proxy-manager-and-safari-ios-macos-no-access/142234/13