I have a new node-red running on a new AWS instance (after my 2017 was getting too old:-). Anyway, it's working nicely, but I'm getting the lost connection to server message: Lost connection to server, reconnecting in 54s. [Try now] I searched this forum and see the same error. I'm not running …

Also, open the developer tools and select the Network tab. Refresh the page and look for the entry of type websockets and see what it says. I suspect that it is not connecting.

"I can carry on doing things" - but the "popup" is at the top of the screen and stays open Lost connection to server, reconnecting in 16s. [Try now] As for network and web sockets .. I assume on AWS server? I don't see anything about web sockets. What ports are being used? Maybe I don't have …

You should see something like this [image] Try googling for how to enable websocket access on AWS server.

[image] knowledgeshark: What ports are being used? Websocket connections are a bit odd. They initially connect over HTTP(S) so they are on the same port as the Node-RED admin ExpressJS server (1880 by default). But they then "upgrade" their connection to WS(S). In your network tab, you should…

[image] Colin: websocket access I'm not seeing anything like you show. There are 3 areas I have control: the processes on the box (eg node-red), so a "ps -ef" shows things there. the ports open, so my 2000 (for my node-red) some high level AWS things (but not at the process level, or the we…

How do I get to a window like you show? I have all linux command, like "netstat". But in general my AWS instance is just a processor with a firewall and ports.

[image] knowledgeshark: How do I get to a window like you show? You simply open the dev tools in your (desktop) browser then go to the network tab.

OK, I see this under the "developer" of a web page (the node-red one). Here is some: /bot is a Redirect to port 2000 Gets error: [Error] WebSocket connection to 'wss://semanticmarkers.com/bot/comms' failed: There was a bad response from the server. (x5) Summary URL: wss://semanticmarkers.co…

OK, that makes one thing fairly clear I think. This is an AWS configuration issue. How, for example, is AWS hiding the Node-RED port? That strikes me as it running a proxy which isn't, perhaps, correctly configured to handle websockets. I'm not sure how many people on the forum use AWS, I don't, f…

Lost Connection to server, reconnecting on AWS linux

General

knowledgeshark 8 May 2026 00:25 21

By the way I might have misspoke that it worked on my previous AWS, as this LINK shows that from at least 2021 I was following this issue.

I'll look at this thread to gain any insight.

ps. I just tried from my iPhone browser, and that Lost Connection shows up.

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Lost Connection to server, reconnecting on AWS linux

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