SLZB-06M Connection Refused Error After Updating to 2.9.2

Configuration Zigbee
1

After accepting the update to 2.9.2 for the SLZB inside of HA, z2mqtt no longer starts. I tried downgrading to 2.8.7, which was working before, with the same errors. No other changes were made. SLZB logs don’t show any errors, and in fact shows “new client” with my HA instance IP, which to me indicates a connection. I just can’t seem to figure this out, I’ve restarted Z2MQTT, and even the entire HA VM. .11 is my SLZB IP and the port is correct, However Z2MQTT shows the following:

[2025-06-23 08:33:17] info: 	zh:ember:uart:ash: ======== ASH stopped ========
[2025-06-23 08:33:17] error: 	zh:ember:uart:ash: Failed to init port with error Error: connect ECONNREFUSED 192.168.1.11:6638
[2025-06-23 08:33:17] error: 	z2m: Error while starting zigbee-herdsman
[2025-06-23 08:33:17] error: 	z2m: Failed to start zigbee-herdsman
[2025-06-23 08:33:17] error: 	z2m: Check https://www.zigbee2mqtt.io/guide/installation/20_zigbee2mqtt-fails-to-start_crashes-runtime.html for possible solutions
[2025-06-23 08:33:17] error: 	z2m: Exiting...
[2025-06-23 08:33:17] error: 	z2m: Error: Failed to start EZSP layer with status=HOST_FATAL_ERROR.
    at EmberAdapter.initEzsp (/app/node_modules/.pnpm/[email protected]/node_modules/zigbee-herdsman/src/adapter/ember/adapter/emberAdapter.ts:666:19)
    at processTicksAndRejections (node:internal/process/task_queues:105:5)
    at EmberAdapter.start (/app/node_modules/.pnpm/[email protected]/node_modules/zigbee-herdsman/src/adapter/ember/adapter/emberAdapter.ts:1548:24)
    at Controller.start (/app/node_modules/.pnpm/[email protected]/node_modules/zigbee-herdsman/src/controller/controller.ts:133:29)
    at Zigbee.start (/app/lib/zigbee.ts:71:27)
    at Controller.start (/app/lib/controller.ts:102:13)
    at start (/app/index.js:149:5)
2

Did you try to restart the SLZB-06M ?

3

Yes, I tried restarting through the OS multiple times as well as power cycling the SLZB, it is currently on POE ethernet.

4

Try to unplug the ethernet cable, and replug. It is a network error.

5

Take it of POE too! Go to a USB power source just for safe measure and eliminate possible POE power issues.

What ZigBee firmware are you on?

6

I figured out the issue, upon upgrading to 2.9.2 the SLZB reverted itself back to USB mode unexpectedly.

7

What kind of “possible POE issues?”

8

If you update the firmware via HA vs SLZB’s interface, it reverts to USB mode. Not sure why.

Power and Mode issues… Search the forum and you’ll see, you aren’t the first or last.

I’d suggest accessing your SLZB via the device IP or http://slzb-06m if you aren’t already