Infos:
- Used Zammad version: 3.6.x
- Used Zammad installation source: CentOS 7 package
- Operating system: CentOS 7
- Browser + version: Google Chrome (newest)
- Firewall: Sophos XG
Actual behavior:
[error] 18835#0: *558 upstream prematurely closed connection while reading response header from upstream, client: xxx.xxx.xxx.xxx, server: support.xxx.ch, request: “GET /ws HTTP/1.1”, upstream: “http://127.0.0.1:6042/ws”, host: “support.xxx.ch”
Steps to reproduce the behavior:
Everything works properly in the internal network.Only as soon as the chat is to be accessed externally via the Sophos XG, I get the following message in the browser:
WebSocket connection to ‘wss://support.xxx.ch/ws’ failed: Error during WebSocket handshake: Unexpected response code: 502
e.connect @ chat.min.js:1
(anonymous) @ chat.min.js:1
e @ chat.min.js:1
(anonymous) @ (index):525
j @ jquery.js?ac63be:2
fireWith @ jquery.js?ac63be:2
ready @ jquery.js?ac63be:2
K @ jquery.js?ac63be:2