MCU Connection Failed (0x0020)

[User3Inc]

This morning we started to get the following error "MCU Connection Failed (0x0020)" when attempting to start a webmeeting.

Upon reviewing the logs, we get the following errors and warnings:

2024-02-08 14:05:38.6663|ERROR|WebMeetingBridge.RouterController|MCU Connection Failed: mcu-wmr-uk-50059.3cx.net:443
2024-02-08 14:05:58.6437|WARN|McuRouter.RemoteServiceManager`1|Mcu mcu-wmr-uk-50059.3cx.net status=Disconnected, restarting
2024-02-08 14:06:00.9957|WARN|McuRouter.StoredLockedList`1|CloudMcu mcu-wmr-uk-50059.3cx.net was offline for 1064049966.0165956 minutes, force meeting close
2024-02-08 14:06:24.9474|ERROR|WebMeetingBridge.RouterController|MCU Connection Failed: mcu-wmr-uk-50059.3cx.net:443
2024-02-08 14:06:44.9412|WARN|McuRouter.RemoteServiceManager`1|Mcu mcu-wmr-uk-50059.3cx.net status=Disconnected, restarting
2024-02-08 14:07:00.9962|WARN|McuRouter.StoredLockedList`1|CloudMcu mcu-wmr-uk-50059.3cx.net was offline for 1064049967.0166045 minutes, force meeting close
2024-02-08 14:35:46.1988|ERROR|WebMeetingBridge.RouterController|MCU Connection Failed: eu0178-lon.3cx.net:443
2024-02-08 14:36:00.0196|WARN|McuRouter.StoredLockedList`1|CloudMcu eu0178-lon.3cx.net was offline for 1064049996.0003272 minutes, force meeting close
2024-02-08 14:41:54.1568|ERROR|WebMeetingBridge.RouterController|MCU Connection Failed: eu0178-lon.3cx.net:443
2024-02-08 14:42:00.0271|WARN|McuRouter.StoredLockedList`1|CloudMcu eu0178-lon.3cx.net was offline for 1064050002.0004529 minutes, force meeting close
2024-02-08 14:56:32.9082|ERROR|WebMeetingBridge.RouterController|MCU Connection Failed: eu0179-lon.3cx.net:443
2024-02-08 14:56:52.9078|WARN|McuRouter.RemoteServiceManager`1|Mcu eu0179-lon.3cx.net status=Disconnected, restarting
2024-02-08 14:57:00.0416|WARN|McuRouter.StoredLockedList`1|CloudMcu eu0179-lon.3cx.net was offline for 1064050017.0006949 minutes, force meeting close
2024-02-08 14:58:00.0404|WARN|McuRouter.StoredLockedList`1|CloudMcu eu0179-lon.3cx.net was offline for 1064050018.0006741 minutes, force meeting close
2024-02-08 14:58:14.9766|ERROR|WebMeetingBridge.RouterController|MCU Connection Failed: eu0179-lon.3cx.net:443
2024-02-08 14:58:37.8315|ERROR|WebMeetingBridge.RouterController|MCU Connection Failed: eu0179-lon.3cx.net:443
2024-02-08 14:58:57.8167|WARN|McuRouter.RemoteServiceManager`1|Mcu eu0179-lon.3cx.net status=Disconnected, restarting
2024-02-08 14:59:00.0416|WARN|McuRouter.StoredLockedList`1|CloudMcu eu0179-lon.3cx.net was offline for 1064050019.0006942 minutes, force meeting close
2024-02-08 14:59:35.3795|ERROR|WebMeetingBridge.RouterController|MCU Connection Failed: eu0179-lon.3cx.net:443
2024-02-08 14:59:55.3657|WARN|McuRouter.RemoteServiceManager`1|Mcu eu0179-lon.3cx.net status=Disconnected, restarting
2024-02-08 15:00:00.0388|WARN|McuRouter.StoredLockedList`1|CloudMcu eu0179-lon.3cx.net was offline for 1064050020.0006477 minutes, force meeting close
2024-02-08 15:00:21.9679|ERROR|WebMeetingBridge.RouterController|MCU Connection Failed: eu0179-lon.3cx.net:443
2024-02-08 15:00:41.9319|WARN|McuRouter.RemoteServiceManager`1|Mcu eu0179-lon.3cx.net status=Disconnected, restarting
2024-02-08 15:01:00.0459|WARN|McuRouter.StoredLockedList`1|CloudMcu eu0179-lon.3cx.net was offline for 1064050021.0007652 minutes, force meeting close

The server is resolving eu0179-lon.3cx.net with the IP 167.99.200.82 which matches the IP using https://toolbox.googleapps.com/apps/dig/#A/

Running a wget https://eu0179-lon.3cx.net connects and replies with ERROR 404: Not Found. which I believe is the expected reply.

Outbound traffic is not blocking the requests.

Please can you suggest any further troubleshooting steps.

Thanks,

 

[MarcelloV]

Hello @User3Inc, try to restart 3CX Gateway Service. It seems that MCU server is refusing connections from your PBX. If you send me a PM with your PBX FQDN I can troubleshoot.

 

[User3Inc]

Hello @User3Inc, try to restart 3CX Gateway Service. It seems that MCU server is refusing connections from your PBX. If you send me a PM with your PBX FQDN I can troubleshoot.

Thanks for your reply.

Does restarting the 3CX Gateway Service impact audio calls? Or should it be done out of hours?
Thanks

 

[MarcelloV]

Hello, restarting the service could impact calls, so it's better to restart it when there are no running calls.

 

[nikolascx]

Hi Team
Calls via sip trunks are not affected.
Calls via extensions either.
The Gateway only handles calls via webmeeting and callers calling in via PSTN to Webmeeting.
Just restart it quick to see if the problem persists.
Thank you so much and thanks for reporting. We are checking.

 

[User3Inc]

Thanks both for your suggestion.
We restarted the service out of hours and Web Meetings are now working.