Dear all,

The error message:
2017/01/05 18:28:49 [error] 32633#32633: *3 upstream prematurely closed connection while reading response header from upstream, client: xxx.xxx.xxx.xxx, server: server_hostname.domain.ltd, request: "POST /SOGo/connect HTTP/2.0", upstream: "https://ip_server:port_number/SOGo/connect", host: "server_hostname.domain.ltd:port_number", referrer: "https://server_hostname.domain.ltd:port_number/SOGo/"
2017/01/05 18:28:49 [error] 32633#32633: *3 upstream prematurely closed connection while reading response header from upstream, client: xxx.xxx.xxx.xxx, server: server_hostname.domain.ltd, request: "GET /SOGo.woa/WebServerResources/busy.gif HTTP/2.0", upstream: "https://ip_server:port_number/SOGo.woa/WebServerResources/busy.gif", host: "server_hostname.domain.ltd:port_number", referrer: "https://server_hostname.domain.ltd:port_number/SOGo/"

I have a front-end reverse proxy using Nginx for my web server and
for the web interface of my email server using Sogo.

From my firewall:
- If I NAT the "Sogo" port to my reverse-proxy I do
have these error and a 502 Bad Gateway message.
- If I bypass my reverse-proxy and NAT directly to my email server,
this is working.

On my reverse-proxy server, I am using Nginx version 1.9.10 (debian 8)
On my email server, I am using Nginx version 1.6.2 (debian 8)

If you need more information, please ask ... I do not understand
this error myself.

ps: it is the second time I am sending this email (?)


--
Cordialement,
Thierry e-mail : lenaigst@maelenn.org
PGP Key: 0xB7E3B9CD

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