# Firefox can’t establish a connection to the server at wss://localhost:4443/openvidu

**URL:** <https://openvidu.discourse.group/t/firefox-can-t-establish-a-connection-to-the-server-at-wss-localhost-4443-openvidu/832>\
**Category:** Issues developing apps\
**Tags:** v2\
**Created:** [May 17, 2020, 5:34pm UTC](https://openvidu.discourse.group/t/firefox-can-t-establish-a-connection-to-the-server-at-wss-localhost-4443-openvidu/832 "2020-05-17T17:34:12Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Raphael](https://yyz2.discourse-cdn.com/free1/user_avatar/openvidu.discourse.group/raphael/32/766_2.png) [@Raphael](https://openvidu.discourse.group/u/Raphael)\
**Post date:** [May 17, 2020, 5:34pm UTC](https://openvidu.discourse.group/t/firefox-can-t-establish-a-connection-to-the-server-at-wss-localhost-4443-openvidu/832/1 "2020-05-17T17:34:12Z")

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Hello,  
I try to run the mvc-java app, but I get this error in the Firefox console when I join a session :

> Firefox can’t establish a connection to the server at wss://localhost:4443/openvidu.  
> Reconnection error:  
> error  
> bubbles: false  
> cancelBubble: false  
> cancelable: false  
> composed: false  
> currentTarget: null  
> defaultPrevented: false  
> eventPhase: 0  
> explicitOriginalTarget: WebSocket { url: “wss://localhost:4443/openvidu”, readyState: 3, bufferedAmount: 0, … }  
> isTrusted: true  
> originalTarget: WebSocket { url: “wss://localhost:4443/openvidu”, readyState: 3, bufferedAmount: 0, … }  
> returnValue: true  
> srcElement: WebSocket { url: “wss://localhost:4443/openvidu”, readyState: 3, bufferedAmount: 0, … }  
> target: WebSocket { url: “wss://localhost:4443/openvidu”, readyState: 3, bufferedAmount: 0, … }  
> timeStamp: 575611  
> type: “error”  
> \<get isTrusted()\>: function isTrusted()  
> : EventPrototype { composedPath: composedPath(), stopPropagation: stopPropagation(), stopImmediatePropagation: stopImmediatePropagation(), … }

There is no video.  
To start Openvidu server I use this command :

> docker run -p 4443:4443 --rm -e OPENVIDU\_SECRET=MY\_SECRET openvidu/openvidu-server-kms:2.14.0

I tried using Ubuntu 18.04.4 and Ubuntu 20.04.  
Can someone help me please ?

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**Author:** ![CSantosM](https://yyz2.discourse-cdn.com/free1/user_avatar/openvidu.discourse.group/csantosm/32/16_2.png) [@CSantosM](https://openvidu.discourse.group/u/CSantosM)\
**Post date:** [May 17, 2020, 5:45pm UTC](https://openvidu.discourse.group/t/firefox-can-t-establish-a-connection-to-the-server-at-wss-localhost-4443-openvidu/832/2 "2020-05-17T17:45:52Z")

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Go to [https://localhost:4443](https://localhost:4443) and accept the certificate.

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**Author:** ![Raphael](https://yyz2.discourse-cdn.com/free1/user_avatar/openvidu.discourse.group/raphael/32/766_2.png) [@Raphael](https://openvidu.discourse.group/u/Raphael)\
**Post date:** [May 17, 2020, 5:52pm UTC](https://openvidu.discourse.group/t/firefox-can-t-establish-a-connection-to-the-server-at-wss-localhost-4443-openvidu/832/3 "2020-05-17T17:52:16Z")

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It is working now, thank you very much 🙂

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**Author:** ![Ying\_Chen](https://yyz2.discourse-cdn.com/free1/user_avatar/openvidu.discourse.group/ying_chen/32/848_2.png) [@Ying\_Chen](https://openvidu.discourse.group/u/Ying_Chen)\
**Post date:** [August 14, 2020, 6:34pm UTC](https://openvidu.discourse.group/t/firefox-can-t-establish-a-connection-to-the-server-at-wss-localhost-4443-openvidu/832/4 "2020-08-14T18:34:28Z")

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Hi, when I go to the [https://localhost:4443](https://localhost:4443/), the browser asks to provide username and password. Do you know what is the username and password for that?

I was running openvidu/openvidu-server-kms docker image to build the server.

Thanks ahead!

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**Author:** ![vipin\_mishra](https://yyz2.discourse-cdn.com/free1/user_avatar/openvidu.discourse.group/vipin_mishra/32/32_2.png) [@vipin\_mishra](https://openvidu.discourse.group/u/vipin_mishra)\
**Post date:** [August 14, 2020, 7:20pm UTC](https://openvidu.discourse.group/t/firefox-can-t-establish-a-connection-to-the-server-at-wss-localhost-4443-openvidu/832/5 "2020-08-14T19:20:48Z")

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User name OPENVIDUAPP and password MY\_SECRET  
Thanks