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Websockets on localhost stopped working in 66.0

  • 6 replies
  • 1 has this problem
  • 4739 views
  • Last reply by Istoman

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After updating to Firefox 66.0 on MacOS 10.13.6 today, websockets on my localhost stopped working.

When using Create React App (version of "react-scripts": "2.1.8" => "webpack-dev-server": "3.1.14" => "sockjs": "0.3.19"), hot reload is broken and I get following error in the console:

`The connection to ws://localhost:3000/sockjs-node/743/khw0phgj/websocket was interrupted while the page was loading.`

When I tried https://www.websocket.org/echo.html, it works fine and no problems with hot reload in Chrome 72.0.

How can I debug and fix this problem please? (when I googled the error message, I got a lot of outdated advice from previous versions of Firefox)

Modified by Peter Hozák

Chosen solution

No error in 65.0.2 when I downgraded => most likely a bug in Firefox, reported as https://bugzilla.mozilla.org/show_bug.cgi?id=1536843

Read this answer in context 👍 0

All Replies (6)

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Click the link using Windows 10 and it came up with no progblems and it said also "This Browser Supports WebSocket". So what is the error screenshot saying?

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Chosen Solution

No error in 65.0.2 when I downgraded => most likely a bug in Firefox, reported as https://bugzilla.mozilla.org/show_bug.cgi?id=1536843

Modified by Peter Hozák

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WestEnd said

So what is the error screenshot saying?

The error message was in my original post - repeating here if it was hard to notice:


The connection to ws://localhost:3000/sockjs-node/743/khw0phgj/websocket was interrupted while the page was loading.

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Does toggling this pref on the about:config page make a difference?

  • network.websocket.allowInsecureFromHTTPS
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cor-el said

Does toggling this pref on the about:config page make a difference?
  • network.websocket.allowInsecureFromHTTPS

nope

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I can second this is happening only since 66.0 and also on a Vue dev server (so this is not a react-scripts thing).