Workspace fails to start/open. Caused by Unknown error during websocket connection establishing

[mmorhun]

Describe the bug

When try to open/start a workspace, it fails with Unknown error has happened, try to reload page message. Reload of the page doesn't help.

Che version

nightly

Steps to reproduce

1. Open a workspace
2. Work in it some time
3. Stop the workspace
4. Try to start it again

Expected behavior

Workspace is started as usual

Runtime

minishift

Screenshots

Screen cast

Additional context

No error logs on Che master side.

[akurinnoy]

@mmorhun, I have just faced same issue on minikube on single-user Che.

[mmorhun]

Yes, seems keycloak token is not the problem, because relogin didn't help...
But closing and opening browser again helped.

[sleshchenko]

Something is wrong in cookies or local cache since the incognito window helped in @akurinnoy case.

[l0rd]

@evidolob @olexii4 @benoitf any idea? Is this a regression?

[olexii4]

@mmorhun, I have the same issue on minikube on single-user CHE.
I tried to clean cookies and local cache - didn't help.

[evidolob]

I faced same problem with Che-Theia IDE, for some reasons browser cannot establish websocket connection with Theia backend. See screenshot:

[AndrienkoAleksandr]

+1 Faced with this issue.

[tsmaeder]

I might have filed a duplicate: #15041

[l0rd]

If it can help I've faced this issue as well and when I've switched into chrome incognito mode and I could start the workspace.