Embedded version of Qlik SaaS failed to connect to web socket (4203) (enigma.js)

[andrey-brill]

During establishing connection one of our clients getting constantly: 

Connection Closed: 4203 {"code":"QEP-103","traceId":"0000000000000000f3ff45e22ca0984e"}

Connection Closed: 4203 {"code":"QEP-103","traceId":"00000000000000003fc235b03f3368e9"}

What can be a problem and how to fix this?

[pperdigo]

Likely a permission issue for the user getting the error. I had this error and fixed it by adding the user to the space where the app with content to be embedded was.