Zigbee2MQTTT Frontend not starting

[bjs-pdx]

I'm new to ProxMox and am trying to get a Zigbee2MWTTT lxc working but having all sorts of problems. I used the helper script to create the LXC on a 9.0.3 proxmox installation. I'm using a Aeotec zigbee/zwave Pro 10 adapter and have the z-wave function working.

Here is my configuration.yaml file for the zigbee system (without the advanced section):

version: 4
homeassistant:
  enabled: false
frontend:
  enabled: true
  port: 9442
mqtt:
  base_topic: zigbee2mqtt
  server: mqtt://localhost
serial:
  port: Silicon_Labs_CP2105_Dual_USB_to_UART_Bridge_Controller_00C3AEA6-if00-port0
  adapter: zstack
advanced:

Not sure what I'm missing to the frontend working. Any help would be greatly appreciated. I did try to search but not sure what keywords to use. Found some other items on installing this, but nothing I could determine would help.

[MickLesk]

Whats the Output if you do following:

systemctl stop zigbee2mqtt
cd /opt/zigbee2mqtt
pnpm start

I think its an configuration issue or your Adapterconf has Issues

[bjs-pdx]

Here is the output:```

systemctl stop zigbee2mqtt
cd /opt/zigbee2mqtt
pnpm start

zigbee2mqtt@2.6.0 start /opt/zigbee2mqtt
node index.js

Starting Zigbee2MQTT without watchdog.
[2025-08-14 07:09:54] info: z2m: Logging to console, file (filename: log.log)
[2025-08-14 07:09:54] info: z2m: Starting Zigbee2MQTT version 2.6.0 (commit #unknown)
[2025-08-14 07:09:54] info: z2m: Starting zigbee-herdsman (5.0.4)
[2025-08-14 07:09:54] info: zh:ember: Using default stack config.
[2025-08-14 07:09:54] info: zh:ember: ======== Ember Adapter Starting ========
[2025-08-14 07:09:54] info: zh:ember:ezsp: ======== EZSP starting ========
[2025-08-14 07:09:54] info: zh:ember:uart:ash: ======== ASH Adapter reset ========
[2025-08-14 07:09:54] info: zh:ember:uart:ash: RTS/CTS config is off, enabling software flow control.
[2025-08-14 07:09:54] info: zh:ember:uart:ash: Serial port opened
[2025-08-14 07:09:54] info: zh:ember:uart:ash: ======== ASH starting ========
[2025-08-14 07:09:55] info: zh:ember:uart:ash: ======== ASH connected ========
[2025-08-14 07:09:55] info: zh:ember:uart:ash: ======== ASH started ========
[2025-08-14 07:09:55] info: zh:ember:ezsp: ======== EZSP started ========
[2025-08-14 07:09:55] error: z2m: Error while starting zigbee-herdsman
[2025-08-14 07:09:55] error: z2m: Failed to start zigbee-herdsman
[2025-08-14 07:09:55] error: z2m: Check https://www.zigbee2mqtt.io/guide/installation/20_zigbee2mqtt-fails-to-start_crashes-runtime.html for possible solutions
[2025-08-14 07:09:55] error: z2m: Exiting...
[2025-08-14 07:09:55] error: z2m: Error: Adapter EZSP protocol version (8) is not supported by Host [13-17].
at EmberAdapter.emberVersion (/opt/zigbee2mqtt/node_modules/.pnpm/zigbee-herdsman@5.0.4/node_modules/zigbee-herdsman/src/adapter/ember/adapter/emberadapter.ts:1416:19)
at EmberAdapter.initEzsp (/opt/zigbee2mqtt/node_modules/.pnpm/zigbee-herdsman@5.0.4/node_modules/zigbee-herdsman/src/adapter/ember/adapter/emberadapter.ts:669:9)
at EmberAdapter.start (/opt/zigbee2mqtt/node_modules/.pnpm/zigbee-herdsman@5.0.4/node_modules/zigbee-herdsman/src/adapter/ember/adapter/emberadapter.ts:1547:24)
at Controller.start (/opt/zigbee2mqtt/node_modules/.pnpm/zigbee-herdsman@5.0.4/node_modules/zigbee-herdsman/src/controller/controller.ts:134:29)
at Zigbee.start (/opt/zigbee2mqtt/lib/zigbee.ts:67:27)
at Controller.start (/opt/zigbee2mqtt/lib/controller.ts:101:13)
at start (/opt/zigbee2mqtt/index.js:149:5)
 ELIFECYCLE  Command failed with exit code 1.

[MickLesk]

Check zigbee2mqtt Repo, i think its an issue with the Adapter

[bjs-pdx]

I’ll continue researching there, but would that prevent the front end web service starting? Can’t access the page and nothing in the logs shows it trying to start.

[MickLesk]

Yep
In past are many Issues with ember and zstack Adapters

[bjs-pdx]

Seems to be something with zigbee2MQTT and the adapter. Went in to the HA installation on ProxMox, deleted the Zigbee integration and recreated it there using the pass-through of the adapter and it is working. Doesn't seem to like the other LXC.