What, specifically, am I looking for? There’s nothing in the list that says “Zigbee”.
I did find ttyACM0, but port: /dev/ttyACM0 doesn’t work either.
You are looking for your zigbee dongle.
If you can’t see it, try plugging it into a windows PC. Does it show up under “Other Devices” in device managed?
If not there may be something wrong with your dongle.
No, it just mounts as a COM port.
But, my Z-wave devices do work, so how could the dongle be bad?
I can see all my devices in the Z-Wave JS UI.
If I use: port: /dev/ttyACM0
there are no errors in the log, but the UI gives a 502 (Bad Gateway) error.
All I did was to restore my HA from a 2-day old backup.
Whats the brand of your stick? I had this exact same problem a few months ago with a sonoff stick. Turned out to be a “dodgy” nvram. I had a lot of hassle to restore my config (stick config).
From the error:
Someone tell me again, why Zigbee2MQTT instead of ZHA?
Have you tried this? From Zigbee2MQTT fails to start | Zigbee2MQTT
Verify that the user you run Zigbee2MQTT as has write access to the port
This can be tested by executing: test -w [PORT] && echo success || echo failure ( e.g. test -w /dev/ttyACM0 && echo success || echo failure).
If it outputs failure it could mean your user does not have access to the port. To test assign write access by executing: sudo chown [USER] [PORT] (e.g. sudo chown pi /dev/ttyACM0).
if it outputs failure, then you need to permanently give your user permission to the device.
#Method 1: Give your user permissions on every reboot.
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I had some issues like this a while ago, I tried everything and nothing worked. Ended up reflashing the USB stick and then suddenly everything was golden.
Is this a serious question or out of frustration?
Thanks, but as I said above (almost) all of my Zigbee devices are working. I can see them on ZWave-JS, but Zigbee2MQTT won’t start.
I’ve never used Z-wave so excuse me if I have misunderstood something, but how is Zwave related to Zigbee2Mqtt and why would you see Zigbee-devices there if your Zigbee stick is not communicating properly?
You’re right, one has nothing to do with the other and very strange that his zigbee devices are working… 
Strange is my middle name.
This is what my hardware shows for ttyACM0:
DEVLINKS: >-
/dev/serial/by-id/usb-0658_0200-if00
/dev/serial/by-path/pci-0000:00:14.0-usb-0:4:1.0
DEVNAME: /dev/ttyACM0
DEVPATH: /devices/pci0000:00/0000:00:14.0/usb1/1-4/1-4:1.0/tty/ttyACM0
ID_BUS: usb
ID_MODEL: '0200'
ID_MODEL_ENC: '0200'
ID_MODEL_ID: '0200'
ID_PATH: pci-0000:00:14.0-usb-0:4:1.0
ID_PATH_TAG: pci-0000_00_14_0-usb-0_4_1_0
ID_REVISION: '0000'
ID_SERIAL: '0658_0200'
ID_TYPE: generic
ID_USB_DRIVER: cdc_acm
ID_USB_INTERFACES: ':020201:0a0000:'
ID_USB_INTERFACE_NUM: '00'
ID_USB_MODEL: '0200'
ID_USB_MODEL_ENC: '0200'
ID_USB_MODEL_ID: '0200'
ID_USB_REVISION: '0000'
ID_USB_SERIAL: '0658_0200'
ID_USB_TYPE: generic
ID_USB_VENDOR: '0658'
ID_USB_VENDOR_ENC: '0658'
ID_USB_VENDOR_ID: '0658'
ID_VENDOR: '0658'
ID_VENDOR_ENC: '0658'
ID_VENDOR_ID: '0658'
MAJOR: '166'
MINOR: '0'
SUBSYSTEM: tty
TAGS: ':systemd:'
USEC_INITIALIZED: '4475517338'
Z-wave is a big mystery to me. Why do I need Zigbee2MQTT anyway? I just want to add or delete Zigbee devices to my network.
When I use /dev/serial/by-id/usb-0658_0200-if00, the log shows errors connecting to the dongle. When I use /dev/ttyACM0, there are no log errors, but I get a 502 Bad Gateway error when opening the UI.
So you can control Zigbee devices connected to your Sonoff stick? Z-wave is a totally different protocol, has nothing to do with Zigbee. I would still reflash your stick, it does not require repairing devices.
Stephen Strange Mann: make sure you don’t have ZHA enabled, this seems to happen a lot when starting with z2m.
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DOH! Senior moment here. Thanks for pointing out my confusion.
99% of my devices are WiFi and I only have a few Z-wave switches. That’s all working.
It’s just my Zigbee door sensors that aren’t. I don’t know why I got the two protocols confused
When you find yourself in a hole- stop digging.
Forget Z-wave; that’s all working. I have two Zigbee door switches that aren’t working since the system restore. Zigbee2MQTT won’t start.
I feel really stupid this morning. Can I just delete the whole thread and start over?
It’s better to learn from your mistakes by confronting yourself with them… 
Again: make sure you don’t have the ZHA integration loaded.