Summary mattermost client alert a red bar on the top ,shows Please check connection, Mattermost unreachable. If issue persists, ask administrator to check WebSocket port Steps to reproduce My site is mattermost 5.19.1 on windows 2016 with reverse proxy on IIS <config.json> { “ServiceSettings”…

Failed to upgrade websocket connection

robert9780 (robert lo) February 14, 2020, 8:48am 8

@ahmaddanial
I add the origin to ‘AllowCorsFrom’ parameter in config.json and it works!
Thanks for your help!

2 Likes

Self-Hosting Issues with Calls Plugin over HTTPS

Topic		Replies	Views
[Solved] Error: Please check connection, Mattermost unreachable. If issue persists, ask administrator to check WebSocket port Troubleshooting	22	8771	March 8, 2023
Please check connection, Mattermost unreachable. If issue persists(...) check WebSocket port Troubleshooting	9	494	April 17, 2024
IOS Only Websocket issue Troubleshooting	0	534	January 16, 2020
Mattermost reports Please check connection, Mattermost unreachable. If issue persists, ask administrator to check WebSocket port Troubleshooting	1	1730	July 24, 2023
Websocket problem Docs - Help Wanted	1	1578	July 22, 2021