Zha: failed to connect to slzb-06m

Configuration
1

Hi
some weeks ago I have successfully connected slzb-06m in ethernet mode with zha. Now it showed some error, so I deleted the integration and started new. The integration has been recognised again, the IP is correct but it still just fails:

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The only error (just a warning) I see in the log is the following:
Logger: bellows.ezsp
Source: components/zha/config_flow.py:280
First occurred: 2:47:40 PM (2 occurrences)
Last logged: 2:47:42 PM

Protocol version 14 is not supported, using version 13 instead

Any idea on what to do / what to check?

Home Assistant is running in a container in my synology nas btw (that’s why I got an ethernet coordinator).

2

Just to add, in the web ui of slzb06 I can see the connection try from home assistant, it gets disconnected immediately:
[15:08:21] taskZB | New client: 192.168.0.83 id: 0
[15:08:22] taskZB | Client disconnected, id: 0

3

You have tried the usual steps of rebooting HA, rebooting the SLZB and so on?

4

yes rebooted slzb, rebooted ha multiple times. Even updated the firmware on the slzb.
What could be done else? Is there any configuration in ha to delete? I didn’t use zigbee much yet, so no loss of any important stuff.

5

Nothing you can do but wait for an update to be pushed to ZHA, according to this.

All thanks should go to @Hedda - all I did was google the error you got.

6

Thanks, didn’t find it in google. however, I found out, that my HA was still on v 2004.6, so I updated it to the latest version. And all worked well afterwards including zha.

1 Like
7

I have the same issue. I am running the most current HA 2025.8.2 in a virtual box on virtual windows in TrueNas. Internet & updates are fine and available. I have also been able to get Zigbee2MQTT up and running, but the integration of Zigbee Home Automation gives the above error. I’m pretty much at my wits end with this. Would appriciate any and all help.

8

Do you want to use Zigbee2MQTT and ZHA at the same time on one coordinator ? Won’t work, you have to choose, or buy a second coordinator.

9

Thank you for that,
I was just coming around to that conclusion as when I got home tonight my automations wern’t working. I checked HA to see that ZHA had integrated, but Zigbee2MQTT was no longer working. A reboot later Zigbee2MQTT was working again and ZHA was nolonger setup.

I guess I choose Zigbee2MQTT then.

Interestingly I had them both working on a previous installation at the same time. I scrapped that installation as it kept having odd errors, may very well have been related…
Thanks again

10

Some have reported being able to connect both simultaneously to certain ethernet coordinators. I can see how it could work (or at least appear to at first glance), but I’m skeptical of the stability.

None of the components are intended to work in such a manner.

11

Just in case this is useful to someone, I had the same issue.
I could get it go away by upgrading the SLZB-06 radio firmware to 20240710.
The SLZB-06 OS is v2.9.8. It is connected via Ethernet, Wifi is off.
It now works with ZHA with Homeassistant at version 2025.8.3 on HA OS 16.1 (in a VM on proxmox).