# Mediasoup demo not working? Web socket connection error **URL:** \ **Category:** mediasoup-demo\ **Created:** [March 30, 2023, 8:48am UTC](https://mediasoup.discourse.group/t/mediasoup-demo-not-working-web-socket-connection-error/5113 "2023-03-30T08:48:48Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![screamcz](https://avatars.discourse-cdn.com/v4/letter/s/47e85d/32.png) [@screamcz](https://mediasoup.discourse.group/u/screamcz)\ **Post date:** [March 30, 2023, 8:48am UTC](https://mediasoup.discourse.group/t/mediasoup-demo-not-working-web-socket-connection-error/5113/1 "2023-03-30T08:48:48Z")
Can you use mediasoup demo ? From yesterday, I can not use demo page. ---
**Author:** ![screamcz](https://avatars.discourse-cdn.com/v4/letter/s/47e85d/32.png) [@screamcz](https://mediasoup.discourse.group/u/screamcz)\ **Post date:** [March 30, 2023, 11:51am UTC](https://mediasoup.discourse.group/t/mediasoup-demo-not-working-web-socket-connection-error/5113/2 "2023-03-30T11:51:29Z")
If you solve the problem, Could you write how to solve the problem ? We also facing same issue on our service. ---
**Author:** ![ibc](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/ibc/32/1540_2.png) [@ibc](https://mediasoup.discourse.group/u/ibc)\ **Post date:** [March 30, 2023, 11:57am UTC](https://mediasoup.discourse.group/t/mediasoup-demo-not-working-web-socket-connection-error/5113/3 "2023-03-30T11:57:10Z")
We are investigating a probably new bug: [mediasoup-worker crash: free(): invalid pointer · Issue #1042 · versatica/mediasoup · GitHub](https://github.com/versatica/mediasoup/issues/1042) This is not about how to solving the problem in your server. You should check your logs and core dumps and, if there is a mediasoup-worker crash, report a proper error as explained in the website: [mediasoup :: Support](https://mediasoup.org/support/#crashes-in-mediasoup-get-a-core-dump)