# Unable to start calls **URL:** \ **Category:** Troubleshooting\ **Created:** [June 29, 2023, 1:24pm UTC](https://forum.mattermost.com/t/unable-to-start-calls/16306 "2023-06-29T13:24:47Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![supe](https://avatars.discourse-cdn.com/v4/letter/s/58956e/32.png) [@supe](https://forum.mattermost.com/u/supe)\ **Post date:** [June 29, 2023, 1:24pm UTC](https://forum.mattermost.com/t/unable-to-start-calls/16306/1 "2023-06-29T13:24:47Z")
**Summary** It’s unable to start voice call from web version as well from any mobile client **Steps to reproduce** I’m using self-hosted version on hetzner VPS server, no docker involved ```auto Mattermost Version: 7.10.2 Database Schema Version: 108 Database: postgres ``` **Observed behavior** when I’m trying to start call from web version it results in infinite “connecting to the call message” and there is an error in logs: ```auto { "caller": "app/plugin_api.go:976", "level": "error", "msg": "callback failed: call state is missing from channel state", "origin": "main.(*Plugin).handleLeave websocket.go:454", "plugin_id": "com.mattermost.calls", "timestamp": "2023-06-29 13:09:26.987 Z" } ``` if I’ll try from mobile app - “timed out waiting for peer connection” with two errors going together: ```auto { "caller": "web/context.go:115", "err_where": "", "error": ": api endpoint requires a license", "http_code": 501, "ip_addr": "XXX.XXX.XXX.XXX", "level": "info", "method": "GET", "msg": "api endpoint requires a license", "path": "/api/v4/users/1qgj5f6ieif69m884ymirxjbgh/groups", "request_id": "d8wz3p9uu3rhig3w4yq9ymar6e", "timestamp": "2023-06-29 13:10:31.984 Z", "user_id": "1qgj5f6ieif69m884ymirxjbgh" } ``` and then ```auto { "caller": "app/plugin_api.go:976", "level": "error", "msg": "callback failed: call state is missing from channel state", "origin": "main.(*Plugin).handleLeave websocket.go:454", "plugin_id": "com.mattermost.calls", "timestamp": "2023-06-29 13:10:42.664 Z" } ``` ```auto ss -ntlup | grep '8443' udp UNCONN 0 0 :8443 0.0.0.0:* users:(("plugin-linux-am",pid=31649,fd=20)) udp UNCONN 0 0 :8443 0.0.0.0:* users:(("plugin-linux-am",pid=31649,fd=17)) udp UNCONN 0 0 :8443 0.0.0.0:* users:(("plugin-linux-am",pid=31649,fd=18)) udp UNCONN 0 0 :8443 0.0.0.0:* users:(("plugin-linux-am",pid=31649,fd=15)) udp UNCONN 0 0 :8443 0.0.0.0:* users:(("plugin-linux-am",pid=31649,fd=16)) udp UNCONN 0 0 :8443 0.0.0.0:* users:(("plugin-linux-am",pid=31649,fd=13)) udp UNCONN 0 0 127.0.0.1:8443 0.0.0.0:* users:(("plugin-linux-am",pid=31649,fd=14)) udp UNCONN 0 0 127.0.0.1:8443 0.0.0.0:* users:(("plugin-linux-am",pid=31649,fd=12)) ``` the same from lsof command ```auto lsof -n -i :8443 | grep -v "COMMAND" | wc -l 8 ``` ```auto iptables -L -n -v Chain INPUT (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain FORWARD (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain OUTPUT (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination ``` in addition: ```auto ps ax | grep calls 31649 ? Sl 0:02 plugins/com.mattermost.calls/server/dist/plugin-linux-amd64 ``` ```auto /opt/mattermost/bin/mmctl --local config get PluginSettings.Plugins.com.mattermost.calls { "allowscreensharing": true, "defaultenabled": true, "enablerecordings": false, "enablesimulcast": false, "icehostoverride": "", "iceserversconfigs": "", "jobserviceurl": null, "maxcallparticipants": 0, "maxrecordingduration": 60, "recordingquality": "medium", "rtcdserviceurl": null, "serversideturn": true, "turncredentialsexpirationminutes": 1436, "turnstaticauthsecret": "", "udpserveraddress": "", "udpserverport": 8443 } ``` Could you please help with further diagnostics? thank you in advance, Pavlos ---
**Author:** ![agriesser](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mattermost.com/agriesser/32/5644_2.png) [@agriesser](https://forum.mattermost.com/u/agriesser)\ **Post date:** [June 29, 2023, 3:55pm UTC](https://forum.mattermost.com/t/unable-to-start-calls/16306/2 "2023-06-29T15:55:02Z")
Hi Pavlos and welcome to the Mattermost forums! Is there any firewall in front of your Hetzner VPS? Something that maybe blocks incoming UDP traffic? You need to verify that you can connect from a client to your server on UDP port 8443. You can do that using the `nc` command line utility f.ex. To do that, stop the calls plugin, the local port `8443` on your Hetzner VPS should be unoccupied again. On the VPS, run the following command: ```auto nc -l -u -p 8443 ``` On a client, run: ```auto nc -u 8443 ``` You can then start typing in any of the two commands and the text should appear on both ends when you hit return. If it does not, your connection does not work which will also explain the behaviour you’re experiencing here. ---
**Author:** ![supe](https://avatars.discourse-cdn.com/v4/letter/s/58956e/32.png) [@supe](https://forum.mattermost.com/u/supe)\ **Post date:** [June 30, 2023, 11:49am UTC](https://forum.mattermost.com/t/unable-to-start-calls/16306/3 "2023-06-30T11:49:42Z")
> [@agriesser](#): > > `nc -u` Hi Alexander! Thanks a lot for your reply. I checked the UDP port and it works good ![Screenshot from 2023-06-30 14-45-04](https://us1.discourse-cdn.com/flex020/uploads/mattermost/original/2X/6/69a0d70f173e1908a04ada588f366ce294b70d38.png) What else can I check? ---
**Author:** ![agriesser](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mattermost.com/agriesser/32/5644_2.png) [@agriesser](https://forum.mattermost.com/u/agriesser)\ **Post date:** [June 30, 2023, 7:15pm UTC](https://forum.mattermost.com/t/unable-to-start-calls/16306/4 "2023-06-30T19:15:25Z")
Good question… @streamer45 any ideas what else to check? ---
**Author:** ![streamer45](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mattermost.com/streamer45/32/4133_2.png) [@streamer45](https://forum.mattermost.com/u/streamer45)\ **Post date:** [June 30, 2023, 8:05pm UTC](https://forum.mattermost.com/t/unable-to-start-calls/16306/5 "2023-06-30T20:05:46Z")
@supe Is your VPS public IP address directly assigned to a local interface? I am asking because in the config above you are storing it in the `udpserveraddress` config setting. Usually you would leave that either blank to listen on all available interface or set it to a specific local IP/interface. ---
**Author:** ![supe](https://avatars.discourse-cdn.com/v4/letter/s/58956e/32.png) [@supe](https://forum.mattermost.com/u/supe)\ **Post date:** [July 1, 2023, 1:47pm UTC](https://forum.mattermost.com/t/unable-to-start-calls/16306/6 "2023-07-01T13:47:17Z")
> [@supe](#): > > `/opt/mattermost/bin/mmctl --local config` Hi Claudio @streamer45 ! Thanks for the reply. I have Public IP directly attached as eth0 network interface I left empty field `udpserveraddress` and restarted MM server, but nothing changed , still have the same couple of errorrs for mobile clients and one line for the browser one ---
**Author:** ![streamer45](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mattermost.com/streamer45/32/4133_2.png) [@streamer45](https://forum.mattermost.com/u/streamer45)\ **Post date:** [July 1, 2023, 2:31pm UTC](https://forum.mattermost.com/t/unable-to-start-calls/16306/7 "2023-07-01T14:31:11Z")
Okay, those errors are unrelated with the connectivity issue. Server side it seems well configured. Did you perform the netcat checks from one of those clients unable to connect? ---
**Author:** ![supe](https://avatars.discourse-cdn.com/v4/letter/s/58956e/32.png) [@supe](https://forum.mattermost.com/u/supe)\ **Post date:** [July 4, 2023, 10:29am UTC](https://forum.mattermost.com/t/unable-to-start-calls/16306/8 "2023-07-04T10:29:03Z")
Yes, I did it from one of that clients. And I haven’t any which can make a call. ---
**Author:** ![streamer45](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mattermost.com/streamer45/32/4133_2.png) [@streamer45](https://forum.mattermost.com/u/streamer45)\ **Post date:** [July 4, 2023, 2:23pm UTC](https://forum.mattermost.com/t/unable-to-start-calls/16306/9 "2023-07-04T14:23:51Z")
Alright. To remove any doubts on the client side I’d suggest to create an account on our [Community server](https://community.mattermost.com/) and see if any of these clients are able to successfully connect to calls.