External Zulu Connections Not Working

PBXAct 16.0.21.3

Zulu server is installed and client connections are working when connecting on the same LAN as the PBX or over VPN. External connections are not working. Clients connecting receive error: “There is an error trying to reach the server”.

Zulu client logs show:

March 6th 2023, 3:25:58 pm - debug: WebSocketConnection - connect - Connecting to  - wss://pbx.mydomain.com:8002/
March 6th 2023, 3:25:58 pm - debug: PBXAccount - _onConnecting - b2ab7f29fd991da6acde843e3dbdab8fa1014c8b
March 6th 2023, 3:25:58 pm - debug: Actions - pbxaccount - pbxAccountConnecting - b2ab7f29fd991da6acde843e3dbdab8fa1014c8b
March 6th 2023, 3:25:58 pm - debug: Reducers - auth - PBXACCOUNT_CONNECTING
March 6th 2023, 3:25:58 pm - error: WebSocketConnection - connect - onerror - {"isTrusted":true}
March 6th 2023, 3:25:58 pm - error: PBXAccount - _onError - b2ab7f29fd991da6acde843e3dbdab8fa1014c8b - Server unreachable

Seems like an issue with the websockets. Tested here: https://www.piesocket.com/websocket-tester and received the following error:

- Connecting to: wss://pbx.mydomain.com:8002
- Connection failed, see your browser's developer console for reason and error code.
- Connection closed

I can confirm the websocket ports are open for PJSIP:

Transport:  <TransportId........>  <Type>  <cos>  <tos>  <BindAddress....................>
==========================================================================================

Transport:  0.0.0.0-tls               tls      3     96  0.0.0.0:5061
Transport:  0.0.0.0-udp               udp      3     96  0.0.0.0:5160
Transport:  0.0.0.0-ws                 ws      3     96  0.0.0.0:5060
Transport:  0.0.0.0-wss               wss      3     96  0.0.0.0:5060

Objects found: 4

Ports 8002 and 8089 are open on the LAN firewall. I can telnet to the public IP of the PBX on both ports.

I’ve disabled the firewall within the PBX to isolate the issue, and still cannot connect to the PBX via Zulu from outside of the LAN.

I’m out of ideas at this point. Can anyone please offer up advice to resolve this?

Thank you.

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