# WebSocket Application

**URL:** <https://discourse.nodered.org/t/websocket-application/77712>\
**Category:** General\
**Created:** [19 April 2023 10:17 UTC](https://discourse.nodered.org/t/websocket-application/77712 "2023-04-19T10:17:07Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![boarak](https://avatars.discourse-cdn.com/v4/letter/b/c67d28/32.png) [@boarak](https://discourse.nodered.org/u/boarak)\
**Post date:** [19 April 2023 10:17 UTC](https://discourse.nodered.org/t/websocket-application/77712/1 "2023-04-19T10:17:07Z")

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Hello All,

My question is related to WebSocket. I tried that with the local host and it is working. I can see the message. But I can see that error when I tried it via HoloLens IP address.

**"An error occurred while sending: Error: WebSocket is not open: readyState 0 (CONNECTING)"**  
Do you know what it means?

Thank you very much!

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**Author:** ![TotallyInformation](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/totallyinformation/32/31_2.png) [@TotallyInformation](https://discourse.nodered.org/u/TotallyInformation)\
**Post date:** [19 April 2023 15:01 UTC](https://discourse.nodered.org/t/websocket-application/77712/2 "2023-04-19T15:01:39Z")

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I think that it means you haven't done the setup the way that the hololens wants. It runs a specialist version of Windows as I understand and there is an API (set of API's?). All will have security and other requirements I'm sure.

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**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [18 June 2023 15:02 UTC](https://discourse.nodered.org/t/websocket-application/77712/3 "2023-06-18T15:02:20Z")

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