Server Windows 2012 R2
Installed with this tut: https://docs.mattermost.com/install/prod-windows-2012.html
Mattermost Version 3.7.3
Reversproxy is configured
NO SSL is used.
[2017/03/29 10:19:56 CEST] [EROR] websocket connect err: websocket: origin not allowed
[2017/03/29 10:19:56 CEST] [EROR] /api/v3/users/websocket:connect code=500 rid=zwgkfaegdbga8ms6c6g51wxjgo uid= ip=18.104.22.168 Failed to upgrade websocket connection [details: ]
After update the Mattermost Server from 3.6 to the last version the error are filling the systemlog.
The server runs but, sometimes the messages didn´t show up, only after a refresh.
i googling the error but i didnt find the right solution. I hope that someone can help me.