# Mattermost reports Please check connection, Mattermost unreachable. If issue persists, ask administrator to check WebSocket port

**URL:** <https://forum.mattermost.com/t/mattermost-reports-please-check-connection-mattermost-unreachable-if-issue-persists-ask-administrator-to-check-websocket-port/16478>\
**Category:** Troubleshooting\
**Created:** [July 23, 2023, 6:21am UTC](https://forum.mattermost.com/t/mattermost-reports-please-check-connection-mattermost-unreachable-if-issue-persists-ask-administrator-to-check-websocket-port/16478 "2023-07-23T06:21:03Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![arthur19q3](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mattermost.com/arthur19q3/32/7057_2.png) [@arthur19q3](https://forum.mattermost.com/u/arthur19q3)\
**Post date:** [July 23, 2023, 6:21am UTC](https://forum.mattermost.com/t/mattermost-reports-please-check-connection-mattermost-unreachable-if-issue-persists-ask-administrator-to-check-websocket-port/16478/1 "2023-07-23T06:21:03Z")

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my mattermost instance is installed on my server (127.0.0.1:8065)and then shared over wifi LAN on 192.168.1.4:8065,

it is half-working always reports

> " Please check connection, Mattermost unreachable. If issue persists, ask administrator to check WebSocket port."

and messages sent won’t show up on wifi devices until a manual refresh, but messages sent from these devices (on 192.168.1.4:8065) get automatically updated on 127.0.0.1:8065.

so that i kinda assumed this was a websocket problem.

i tried to fix this by setting “WebsocketURL”: “ws://127.0.0.1:8065/api/v4/websocket”, but the problem persists.

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**Author:** ![amy.blais](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mattermost.com/amy.blais/32/7481_2.png) [@amy.blais](https://forum.mattermost.com/u/amy.blais)\
**Post date:** [July 24, 2023, 12:46pm UTC](https://forum.mattermost.com/t/mattermost-reports-please-check-connection-mattermost-unreachable-if-issue-persists-ask-administrator-to-check-websocket-port/16478/2 "2023-07-24T12:46:14Z")

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The important upgrade notes gives tips on this [Important Upgrade Notes — Mattermost documentation](https://docs.mattermost.com/upgrade/important-upgrade-notes.html). One of the notes mentions about setting the `AllowCorsFrom` to “\*” in mattermost/config/config.json.