# Demo not working on mobile hotspot on two sessions on one machine **URL:** \ **Category:** mediasoup-demo\ **Created:** [February 2, 2022, 3:19pm UTC](https://mediasoup.discourse.group/t/demo-not-working-on-mobile-hotspot-on-two-sessions-on-one-machine/3900 "2022-02-02T15:19:28Z")\ **Posts on this page:** 14\ **Page:** 1
**Author:** ![ksarpotdar](https://avatars.discourse-cdn.com/v4/letter/k/50afbb/32.png) [@ksarpotdar](https://mediasoup.discourse.group/u/ksarpotdar)\ **Post date:** [February 2, 2022, 3:19pm UTC](https://mediasoup.discourse.group/t/demo-not-working-on-mobile-hotspot-on-two-sessions-on-one-machine/3900/1 "2022-02-02T15:19:29Z")
Hi, I was trying the mediasoup demo app at [https://v3demo.mediasoup.org](https://v3demo.mediasoup.org/) demo link, **on internet** transmitted **through mobile hotspot on desktop chrome** Version 97.0.4692.99 (Official Build) (64-bit). I opened one window in normal window and another in the incognito mode. However **it doesn’t play video or audio** on the mediasoup. I had tried this demo link on normal wifi earlier and it worked perfectly, there wasn’t a problem. What might be the issue? **How to produce?** 1. Use Mobile Hotspot for connecting the laptop to the internet using the wifi transmitted through the hotspot 2. Open [https://v3demo.mediasoup.org](https://v3demo.mediasoup.org/) link on the chrome in normal window and start the meeting 3. Copy the meeting url and open the Incognito tab and start the meeting there as well. 4. the audio and video both does not transmit. 5. I observed that the tracks and stream is transferred and the video and audio elements created but the video & audio doesn’t play Your response and resolution would be really helpful. **PS.** I have my normal webRTC Mesh application. that application is able to capture both the camera feeds from these two tabs and able to transmit using rtcPeerConnection and play both videos and audios. ---
**Author:** ![ksarpotdar](https://avatars.discourse-cdn.com/v4/letter/k/50afbb/32.png) [@ksarpotdar](https://mediasoup.discourse.group/u/ksarpotdar)\ **Post date:** [April 9, 2022, 10:08am UTC](https://mediasoup.discourse.group/t/demo-not-working-on-mobile-hotspot-on-two-sessions-on-one-machine/3900/2 "2022-04-09T10:08:01Z")
Dear experts, any luck? ---
**Author:** ![BronzedBroth](https://avatars.discourse-cdn.com/v4/letter/b/ad7895/32.png) [@BronzedBroth](https://mediasoup.discourse.group/u/BronzedBroth)\ **Post date:** [April 9, 2022, 12:11pm UTC](https://mediasoup.discourse.group/t/demo-not-working-on-mobile-hotspot-on-two-sessions-on-one-machine/3900/3 "2022-04-09T12:11:43Z")
NAT issues is all, possibly bad configurations or in need of TURN. Hotspots aren’t all the same so it’s not really easy to give you further explanation. ---
**Author:** ![nazar-pc](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/nazar-pc/32/369_2.png) [@nazar-pc](https://mediasoup.discourse.group/u/nazar-pc)\ **Post date:** [April 9, 2022, 1:53pm UTC](https://mediasoup.discourse.group/t/demo-not-working-on-mobile-hotspot-on-two-sessions-on-one-machine/3900/4 "2022-04-09T13:53:41Z")
mediasoup is not P2P, NAT has nothing to do with this. ---
**Author:** ![ksarpotdar](https://avatars.discourse-cdn.com/v4/letter/k/50afbb/32.png) [@ksarpotdar](https://mediasoup.discourse.group/u/ksarpotdar)\ **Post date:** [April 9, 2022, 2:26pm UTC](https://mediasoup.discourse.group/t/demo-not-working-on-mobile-hotspot-on-two-sessions-on-one-machine/3900/6 "2022-04-09T14:26:48Z")
Dear Cosmosis, Thanks for response. I also suspect it to be NAT problems or ICE connection problem. ---
**Author:** ![ksarpotdar](https://avatars.discourse-cdn.com/v4/letter/k/50afbb/32.png) [@ksarpotdar](https://mediasoup.discourse.group/u/ksarpotdar)\ **Post date:** [April 9, 2022, 2:29pm UTC](https://mediasoup.discourse.group/t/demo-not-working-on-mobile-hotspot-on-two-sessions-on-one-machine/3900/7 "2022-04-09T14:29:51Z")
Thanks Nazar, but the problem is only on mobile hotspot or connecting mobile hotspot and desktop on 4g / mobile data connectivity… Things work very well on wifi… So I suspect there has to some NAT issue. May be you can let us know in case you are able to resolve it. Thanks for support ---
**Author:** ![ksarpotdar](https://avatars.discourse-cdn.com/v4/letter/k/50afbb/32.png) [@ksarpotdar](https://mediasoup.discourse.group/u/ksarpotdar)\ **Post date:** [April 9, 2022, 3:42pm UTC](https://mediasoup.discourse.group/t/demo-not-working-on-mobile-hotspot-on-two-sessions-on-one-machine/3900/8 "2022-04-09T15:42:25Z")
I have more observations from chomre://webrtc-internals. The ICE connection state: new =\> checking =\> disconnected and it shows error as iceconnectionstatechange (legacy) Ideally Mediasoup shouldn’t require TURN server, as its a direct connection over TCP or UDP port, but somehow its not able to resolve the ICE connection. 3 ICE Candidates in the SDP are a=candidate:2358288537 1 udp 2122262783 2402:xxxx:187f:xxxx:318e:6453:12a:cb20 63978 typ host generation 0 network-id 2 network-cost 10 a=candidate:1531540168 1 udp 2122197247 2402:xxxx:187f:xxxx:bc3b:44f2:85ad:3e3c 63979 typ host generation 0 network-id 3 network-cost 10 a=candidate:2832572806 1 udp 2122129151 192.168.xxx.xxx 63980 typ host generation 0 network-id 1 network-cost 10 My end IP is **2402:xxxx:187f:xxxx:bc3b:44f2:85ad:3e3c** , which is a second candidate, but it never tries on that IPV6. the fingerprints are a=fingerprint:sha-256 67:C8:B4:08:E8:00:D3:6F:D0:FC:28:B0:DF:BB:CC:EC:D7:1F:2D:97:57:A9:A2:09:B3:B0:4B:80:B8:DE:F4:65 a=candidate:2358288537 1 udp 2122262783 2402:xxxx:187f:xxxx:318e:6453:12a:cb20 63978 typ host generation 0 network-id 2 network-cost 10 a=candidate:1531540168 1 udp 2122197247 **2402:xxxx:187f:xxxx:bc3b:44f2:85ad:3e3c** **63979** typ host generation 0 network-id 3 network-cost 10 a=candidate:2832572806 1 udp 2122129151 192.168.xxx.xxx 63980 typ host generation 0 network-id 1 network-cost 10 icegatheringstatechange is “complete” setLocalDescriptionOnSuccess signalingstatechange is “stable” transceiverModified iceconnectionstatechange is “disconnected” iceconnectionstatechange (legacy) is “failed” I checked with netstat in windows and the ports are open . So, it must be something at mediasoup side, which is not able to connect. Please do let me know if this helps. ---
**Author:** ![snnz](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/snnz/32/693_2.png) [@snnz](https://mediasoup.discourse.group/u/snnz)\ **Post date:** [April 9, 2022, 4:57pm UTC](https://mediasoup.discourse.group/t/demo-not-working-on-mobile-hotspot-on-two-sessions-on-one-machine/3900/9 "2022-04-09T16:57:42Z")
> [@ksarpotdar](#): > > but it never tries on that IPV6. Why should it try? [v3demo.mediasoup.org](https://v3demo.mediasoup.org/) provides only an IPv4 candidate as far as I know. ---
**Author:** ![ksarpotdar](https://avatars.discourse-cdn.com/v4/letter/k/50afbb/32.png) [@ksarpotdar](https://mediasoup.discourse.group/u/ksarpotdar)\ **Post date:** [April 10, 2022, 6:05am UTC](https://mediasoup.discourse.group/t/demo-not-working-on-mobile-hotspot-on-two-sessions-on-one-machine/3900/10 "2022-04-10T06:05:29Z")
Okay, I thought it supports IPV6 also. But regardless, but the mobile hotspot also has the public IPV4 but still it not connecting the meetings between participants of wifi to mobile hotspot. ---
**Author:** ![snnz](https://yyz2.discourse-cdn.com/free1/user_avatar/mediasoup.discourse.group/snnz/32/693_2.png) [@snnz](https://mediasoup.discourse.group/u/snnz)\ **Post date:** [April 10, 2022, 6:31am UTC](https://mediasoup.discourse.group/t/demo-not-working-on-mobile-hotspot-on-two-sessions-on-one-machine/3900/11 "2022-04-10T06:31:09Z")
Normally the browser would have received it as a peer reflexive candidate by trying to reach the server through 192.168.xxx.xxx first. ---
**Author:** ![ksarpotdar](https://avatars.discourse-cdn.com/v4/letter/k/50afbb/32.png) [@ksarpotdar](https://mediasoup.discourse.group/u/ksarpotdar)\ **Post date:** [April 10, 2022, 7:32am UTC](https://mediasoup.discourse.group/t/demo-not-working-on-mobile-hotspot-on-two-sessions-on-one-machine/3900/12 "2022-04-10T07:32:36Z")
Yes, you are right. I checked the v3demo.mediasoup again and again and also tried downloading and running locally but its not helping… the chrone://webrtc-internals on mobile data shows connection stuck up at “new” ---
**Author:** ![ksarpotdar](https://avatars.discourse-cdn.com/v4/letter/k/50afbb/32.png) [@ksarpotdar](https://mediasoup.discourse.group/u/ksarpotdar)\ **Post date:** [April 10, 2022, 7:33am UTC](https://mediasoup.discourse.group/t/demo-not-working-on-mobile-hotspot-on-two-sessions-on-one-machine/3900/13 "2022-04-10T07:33:58Z")
Please consider this data NOT directly from [v3demo.mediasoup.com](http://v3demo.mediasoup.com) but from the running local copy of it. Thanks. But you can try same on your machines (mobile as well as mobile hotspot and connect to desktop. ---
**Author:** ![ksarpotdar](https://avatars.discourse-cdn.com/v4/letter/k/50afbb/32.png) [@ksarpotdar](https://mediasoup.discourse.group/u/ksarpotdar)\ **Post date:** [April 10, 2022, 8:41am UTC](https://mediasoup.discourse.group/t/demo-not-working-on-mobile-hotspot-on-two-sessions-on-one-machine/3900/14 "2022-04-10T08:41:24Z")
Here is the process; 1. connect to the mobile hotspot (disconnect the wifi) 2. open [mediasoup demo](https://v3demo.mediasoup.org/?roomId=12345678) 3. open chrome://webrtc-internals on another tab 4. open the same url on mobile or 3 test scenarios as open it on any other device - 1. same mobile using same mobile data, - 1. different mobile on its own mobile data or - 1. any another (mobile - desktop - laptop) device with wifi) 1. Now it wont connect. Check the ebrtc-internals. 2. now check the site [My IP Information - WhatIsMyIP.com®](https://www.whatismyip.com/my-ip-information/) to check your own public IP address (IPV4 and IPV6) 3. now check the chrome://webrtc-internals iceCandiate grid for the connections established. It would show local-candidate 192.168.xxx.xxx or some other IP but not the IP shown by public sites as public IP. It will also show remote-candidate is 62.210.xxx.xxx. Which is mediasoup server address of [v3demo.mediasoup.org](http://v3demo.mediasoup.org) 4. now in the command prompt if we do the tracert [mediasoup.org](http://mediasoup.org), it doens’t connect using the IPV4 public IP it shows the IPV6 ip trace… Which means that the IPV4 and IPV6 are being used and being mixed and thats where the issue is. The demo server isn’t configred for IPV6, so it should have picked up the public IP, as the others also give like [My IP Information - WhatIsMyIP.com®](https://www.whatismyip.com/my-ip-information/) Please do let me know after your checking, if there any solution. If solution is in the server side, then please do let me know, I can download and run locally and test. Or best, if the demo can be updated on github and also the actual server [v3demo.mediasoup.org](http://v3demo.mediasoup.org) Thanks ---
**Author:** ![ksarpotdar](https://avatars.discourse-cdn.com/v4/letter/k/50afbb/32.png) [@ksarpotdar](https://mediasoup.discourse.group/u/ksarpotdar)\ **Post date:** [April 11, 2022, 4:38am UTC](https://mediasoup.discourse.group/t/demo-not-working-on-mobile-hotspot-on-two-sessions-on-one-machine/3900/15 "2022-04-11T04:38:49Z")
This seems to be an issue of either mediasoup-client or the mediasoup libray… I am posting another question under that category.