All ZHA devices become unavailable | Home Assistant | Page 1

finite plaza Nov 30, 2025, 11:44 AM

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This happens frequently, maybe once a day. Everything works, then at some point (I usually notice it in the morning) they all stop responding.

I use an SMLIGHT SLZB-06 coordinator if that's relevant.

I'm looking for help on how to troubleshoot.

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The only relevant logs I found are below but I suspect they are just a symptom of something else happening at the coordinator or network level.

2025-11-30 11:39:31.701 DEBUG (MainThread) [homeassistant.components.zha] Failed to set up ZHA
Traceback (most recent call last):
  File "/usr/local/lib/python3.13/site-packages/zigpy_znp/api.py", line 701, in _skip_bootloader
    result = await responses.get()
             ^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.13/asyncio/queues.py", line 186, in get
    await getter
asyncio.exceptions.CancelledError

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/components/zha/__init__.py", line 185, in async_setup_entry
    await zha_gateway.async_initialize()
  File "/usr/local/lib/python3.13/site-packages/zha/application/gateway.py", line 274, in async_initialize
    await self._async_initialize()
  File "/usr/local/lib/python3.13/site-packages/zha/application/gateway.py", line 257, in _async_initialize
    await self.application_controller.startup(auto_form=True)
  File "/usr/local/lib/python3.13/site-packages/zigpy/application.py", line 236, in startup
    await self.connect()
  File "/usr/local/lib/python3.13/site-packages/zigpy_znp/zigbee/application.py", line 73, in connect
    await znp.connect()
  File "/usr/local/lib/python3.13/site-packages/zigpy_znp/api.py", line 744, in connect
    self.capabilities = (await self._skip_bootloader()).Capabilities
                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.13/site-packages/zigpy_znp/api.py", line 700, in _skip_bootloader
    async with asyncio_timeout(CONNECT_PROBE_TIMEOUT):
               ~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.13/asyncio/timeouts.py", line 116, in __aexit__
    raise TimeoutError from exc_val
TimeoutError

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If I attempt to reconfigure the network using the cog icon, it says it can't connect to the coordinator.

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The coordinator is listening on that socket.

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I can access the coordinator's web UI and it shows ZHA greyed out (disconnected).

thorn raven Nov 30, 2025, 12:10 PM

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sounds like a network or interference issue. How did you connect the slzb06? show network info and dashboard info pls.

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have you done a reboot yet?

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connected with lan, ok

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no need to grey out local ip addresses 😉

finite plaza Nov 30, 2025, 12:32 PM

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Yeah abundance of caution really.

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It's connected via ethernet to the main switch.

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It looks like it happened just past 4AM which coincides with a reboot of my router.

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After rebooting the SLZB-06, everything comes back online.

thorn raven Nov 30, 2025, 1:49 PM

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what causes the router to reboot? anything in router logs?

deft terrace Nov 30, 2025, 4:57 PM

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I have the same issue (connection to my zigbee devices gets regularly lost), but I found no connection to the router. Unfortunately, I can't give further help, but I follow just in case we could try something on two different systems.

finite plaza Nov 30, 2025, 7:48 PM

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thorn raven what causes the router to reboot? anything in router logs?

I have it in a cronjob. Don't ask. 🙈 I'm going to replace the router but haven't had the time yet. It might just be a coincidence though. I rebooted it manually a couple hours ago and ZHA was fine.

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In any case, I always expect networked systems to recover from networking partitions. Resilience needs to be built in.

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Another data point, this is likely not related to ZHA. I used to run Z2M and the same thing would happen - in fact, I migrated to ZHA as a blind attempt to fix it.

thorn raven Dec 1, 2025, 6:48 AM

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maybe set your slzb-06 static to same ip as given by router (check router). Use your local dns server 192.168.48.1 for dns1 and dns2

finite plaza Dec 1, 2025, 9:38 AM

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thorn raven maybe set your slzb-06 static to same ip as given by router (check router). Use ...

It's a reserved assignment, I doubt it will make much difference if I set it statically but wth I'll try anything... I'll wait until it happens again though, which didn't today.

finite plaza Dec 4, 2025, 8:56 AM

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A couple developments since last time.

I moved the device to the same VLAN as Home Assistant (it was in the IoT VLAN) while troubleshooting - this suddenly allowed OTA firmware updates to work.

Despite the seeming improvement, the problem still happened this morning, entirely unrelated to a router reboot so that can be crossed off. I made the IP assignment static, put the same local DNS server as both resolvers which rebooted the unit. ZHA is still unresponsive. I restarted the integration, still no luck. I'll restart Home Assistant now.

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Before that I checked logs - absolutely no logs related to Zigbee or ZHA.

thorn raven Dec 4, 2025, 9:02 AM

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instead of restarting ha, do a reboot.. 😉

finite plaza Dec 4, 2025, 9:05 AM

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Still off after restarting, so rebooting now.

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Still off after rebooting. I'll reboot the SLZB again.

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Restarting the integration didn't help, reconfiguring the coordinator in ZHA didn't either. 🤔

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It looks like HA is actually unable to connect to the device, which is odd as there are no firewalls in between them and they're on the same network - traffic should literally just cross ports on the switch.

I can connect to it from my workstation across VLANs though. Still investigating that.

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SLZB shows ZHA connected now, but HA disagrees.

thorn raven Dec 4, 2025, 9:36 AM

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can you reload the slzb integration?

finite plaza Dec 4, 2025, 9:37 AM

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Reloaded it now. ZHA reloaded automatically after that but still no luck.

finite plaza Dec 4, 2025, 10:00 AM

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I put the device back on the IoT VLAN and forced a ZHA migration. That seems to have sorted it for now. I have no idea why, and it may just be a red herring but I need to get back to work. 😆

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And now the automatic backup failed. I wonder if it's related. It has been failing intermittently.

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Error creating backup: Backup failed: [{'type': 'HomeAssistantBackupError', 'message': "Preparing backup of Home Assistant Core failed. Failed to inform HA Core: Unsuccessful websocket message - {'id': 11, 'type': 'result', 'success': False, 'error': {'code': 'pre_backup_actions_failed', 'message': 'Error during pre-backup: '}}.", 'stage': 'home_assistant'}]

finite plaza Dec 7, 2025, 1:18 PM

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I'm back with the ZHA/Zigbee outage. Unrelated to backups. 🙁

finite plaza Dec 7, 2025, 1:38 PM

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Restarting HA didn't help. Rebooting didn't help. Rebooting the SLZB didn't help.

#All ZHA devices become unavailable