Z2m: Error: Failed to connect to the adapter (Error: SRSP - SYS - ping after 6000ms)

Hi,

I had a bit of an issue this evening where something has gone horribly wrong with USB, I think the ports are fragged as I can’t get Z Wave up at all.

Zigbee shouldn’t have been affected but something’s gone wrong as that was working fine and now doesn’t and I can’t work out why even after reading many posts and all the documentation I could find.

I have Z2M connected to an SLZB-06 oven LAN, the adaptor is fine, no problems with that I can see and the config details it produces are:

# Pay attention, if you use the Z2M addon for HA, it is better to edit Z2M addon yaml configuration file directly (Select the 3 dot menu in the upper right corner → "Edit in YAML")
serial:
# Location of SLZB-06
  port: tcp://192.168.2.234:6638
  baudrate: 115200
  adapter: zstack
# Disable green led?
  disable_led: false
# Set output power to max 20
advanced:
  transmit_power: 20

In Z2M I have this as the setup:

data_path: /config/zigbee2mqtt
socat:
  enabled: false
  master: pty,raw,echo=0,link=/tmp/ttyZ2M,mode=777
  slave: tcp-listen:8485,keepalive,nodelay,reuseaddr,keepidle=1,keepintvl=1,keepcnt=5
  options: "-d -d"
  log: false
mqtt:
  server: mqtt://localhost:1883
  base_topic: zigbee2mqtt
  ca: /etc/ssl/mqtt-ca.crt
  key: /etc/ssl/mqtt-client.key
  cert: /etc/ssl/mqtt-client.crt
  user: **
  password: **
serial:
  port: tcp://192.168.2.234:6638
  baudrate: 115200
  adapter: zstack

[20:18:20] INFO: Preparing to start...
[20:18:20] INFO: Socat not enabled
[20:18:20] INFO: Starting Zigbee2MQTT...
Starting Zigbee2MQTT without watchdog.
[2025-12-19 20:18:41] error: 	z2m: Error while starting zigbee-herdsman
[2025-12-19 20:18:41] error: 	z2m: Failed to start zigbee-herdsman
[2025-12-19 20:18:41] error: 	z2m: Check https://www.zigbee2mqtt.io/guide/installation/20_zigbee2mqtt-fails-to-start_crashes-runtime.html for possible solutions
[2025-12-19 20:18:41] error: 	z2m: Exiting...
[2025-12-19 20:18:41] error: 	z2m: Error: Failed to connect to the adapter (Error: SRSP - SYS - ping after 6000ms)
    at ZStackAdapter.start (/app/node_modules/.pnpm/[email protected]/node_modules/zigbee-herdsman/src/adapter/z-stack/adapter/zStackAdapter.ts:115:27)
    at Controller.start (/app/node_modules/.pnpm/[email protected]/node_modules/zigbee-herdsman/src/controller/controller.ts:143:29)
    at Zigbee.start (/app/lib/zigbee.ts:70:27)
    at Controller.start (/app/lib/controller.ts:101:13)
    at start (/app/index.js:149:5)

If it helps the full error I get is the Z2M log is:

Can anyone tell me if there are any errors here I’m missing please?

After much mucking about I finally got it all back up and running.

For reference, I have no idea why but Z2M lost all it’s settings so I had to reset the connection to MQTT as well as the adaptor settings.

Five hours it took me to fix it!

Was it related to the latest updates?

I don’t think so. I think this was pure coincidence with a problem I had with the USB ports which are kaput.

What was odd was, Z2M lost all its settings completely when the USB went and the Yellow restarted.