Error: WebSocket close with status code 1006

[ablajievschii]

• Web Browser: Firefox 84.0 (64-bit)
• Local OS: macOS Big Sur v11.0.1
• Remote OS:
• Remote Architecture:
• code-server --version: 3.7.4 11f5378

Followed the instructions from the README.md to install code-server. It worked with no issues after installation. Installed it about 2 weeks ago.
Today it failed to load in the Firefox. Login page loaded, then i entered password. After that i just saw a blank page.

There is an error in Firefox Web Console
Error: WebSocket close with status code 1006
Details provided in the log files from the code-server and Web Console

The issue is not reproducible in other browsers, like Chrome or Safari.

console-export-2020-12-19_0-41-52.txt
code-server-stdout.log
telemetry.log

[ablajievschii]

Have no idea what was the root cause of this issue. But today it works again. Can't reproduce the issue.
I haven't updated Firefox, it is still the same version.