Unknown client connecting to MQTT broker

[delta010]

The problem

in my home assistant mosquito add-on, an unknown client no client id is connecting and disconnecting as a loop forever
the IP address of the client looks like a docker container IP address (172.30.32.2). my network address is 192.168.0.1 , but I can't find any what container is trying to connect .pleas help me

What is version of Home Assistant Core has the issue?

core-2021.6.2

What was the last working version of Home Assistant Core?

core-2021.4.0

What type of installation are you running?

Home Assistant OS

Integration causing the issue

MQTT

Link to integration documentation on our website

https://www.home-assistant.io/integrations/mqtt/

Example YAML snippet

logins:
  - username: user
    password: 123456789
customize:
  active: false
  folder: mosquitto
certfile: fullchain.pem
keyfile: privkey.pem
require_certificate: false

Anything in the logs that might be useful for us?

1623126169: New connection from 192.168.0.110 on port 1883.
1623126169: New client connected from 192.168.0.110 as sonofflight1 (p2, c1, k30, u'hassio').
1623126184: New connection from 192.168.0.117 on port 1883.
1623126184: New client connected from 192.168.0.117 as keypad (p2, c1, k30, u'hassio').
1623126204: New connection from 172.30.32.1 on port 1883.
1623126204: New client connected from 172.30.32.1 as 2he2ok6kXNV7syNo9EIH5K (p2, c1, k60, u'hassio').
1623126373: New connection from 172.30.32.2 on port 1883.
1623126373: Socket error on client <unknown>, disconnecting.
1623126431: New connection from 172.30.33.5 on port 1883.
1623126431: New client connected from 172.30.33.5 as mqttjs_c8632349 (p2, c1, k60, u'hassio').
1623126493: New connection from 172.30.32.2 on port 1883.
1623126493: Socket error on client <unknown>, disconnecting.
1623126613: New connection from 172.30.32.2 on port 1883.
1623126613: Socket error on client <unknown>, disconnecting.
1623126733: New connection from 172.30.32.2 on port 1883.
1623126733: Socket error on client <unknown>, disconnecting.
1623126853: New connection from 172.30.32.2 on port 1883.
1623126853: Socket error on client <unknown>, disconnecting.
1623126973: New connection from 172.30.32.2 on port 1883.
1623126973: Socket error on client <unknown>, disconnecting.
1623127093: New connection from 172.30.32.2 on port 1883.
1623127093: Socket error on client <unknown>, disconnecting.
1623127213: New connection from 172.30.32.2 on port 1883.
1623127213: Socket error on client <unknown>, disconnecting.
1623127333: New connection from 172.30.32.2 on port 1883.
1623127333: Socket error on client <unknown>, disconnecting.
1623127453: New connection from 172.30.32.2 on port 1883.
1623127453: Socket error on client <unknown>, disconnecting.
1623127573: New connection from 172.30.32.2 on port 1883.
1623127573: Socket error on client <unknown>, disconnecting.
1623127693: New connection from 172.30.32.2 on port 1883.
1623127693: Socket error on client <unknown>, disconnecting.
1623127813: New connection from 172.30.32.2 on port 1883.
1623127813: Socket error on client <unknown>, disconnecting.
1623127933: New connection from 172.30.32.2 on port 1883.
1623127933: Socket error on client <unknown>, disconnecting.
1623127960: Saving in-memory database to /data/mosquitto.db.
1623128053: New connection from 172.30.32.2 on port 1883.
1623128053: Socket error on client <unknown>, disconnecting.
1623128173: New connection from 172.30.32.2 on port 1883.
1623128173: Socket error on client <unknown>, disconnecting.
1623128293: New connection from 172.30.32.2 on port 1883.
1623128293: Socket error on client <unknown>, disconnecting.
1623128413: New connection from 172.30.32.2 on port 1883.
1623128413: Socket error on client <unknown>, disconnecting.
1623128533: New connection from 172.30.32.2 on port 1883.
1623128533: Socket error on client <unknown>, disconnecting.
1623128653: New connection from 172.30.32.2 on port 1883.
1623128653: Socket error on client <unknown>, disconnecting.
1623128773: New connection from 172.30.32.2 on port 1883.
1623128773: Socket error on client <unknown>, disconnecting.
1623128893: New connection from 172.30.32.2 on port 1883.
1623128893: Socket error on client <unknown>, disconnecting.
1623129013: New connection from 172.30.32.2 on port 1883.
1623129013: Socket error on client <unknown>, disconnecting.
1623129133: New connection from 172.30.32.2 on port 1883.
1623129133: Socket error on client <unknown>, disconnecting.
1623129253: New connection from 172.30.32.2 on port 1883.
1623129253: Socket error on client <unknown>, disconnecting.
1623129373: New connection from 172.30.32.2 on port 1883.
1623129373: Socket error on client <unknown>, disconnecting.
1623129493: New connection from 172.30.32.2 on port 1883.
1623129493: Socket error on client <unknown>, disconnecting.
1623129613: New connection from 172.30.32.2 on port 1883.
1623129613: Socket error on client <unknown>, disconnecting.
1623129733: New connection from 172.30.32.2 on port 1883.
1623129733: Socket error on client <unknown>, disconnecting.
1623129761: Saving in-memory database to /data/mosquitto.db.
1623129853: New connection from 172.30.32.2 on port 1883.
1623129853: Socket error on client <unknown>, disconnecting.
1623129973: New connection from 172.30.32.2 on port 1883.

Additional information

No response

[probot-home-assistant]

mqtt documentation
mqtt source
_{^{(message by IssueLinks)}}

[frenck]

That is the supervisor checking if the add-on is still responding as part of a health check. This is expected, not a bug and actually good.

[diagonali]

That is the supervisor checking if the add-on is still responding as part of a health check. This is expected, not a bug and actually good.

Thanks for clarifying @frenck . I've spent quite a bit of time investigating this "issue" since it does after all say "socket error".

I wonder if it's worth mentioning this in the documentation for the addon?

[tdejneka]

FWIW, I'm using Supervisor 2021.06.3 with Mosquitto Add-On 5.1 and it doesn't report the 172.30.32.2 connection and socket errors.

[bruvv]

Running supervisor-2021.06.6 and mosquito 6.0.1 still seeing these log spam

1624635774: New connection from 172.30.32.2 on port 1883.
1624635774: Socket error on client <unknown>, disconnecting.
1624635894: New connection from 172.30.32.2 on port 1883.
1624635894: Socket error on client <unknown>, disconnecting.
1624636014: New connection from 172.30.32.2 on port 1883.
1624636014: Socket error on client <unknown>, disconnecting.
1624636134: New connection from 172.30.32.2 on port 1883.
1624636134: Socket error on client <unknown>, disconnecting.
1624636254: New connection from 172.30.32.2 on port 1883.
1624636254: Socket error on client <unknown>, disconnecting.
1624636367: Saving in-memory database to /data/mosquitto.db.
1624636374: New connection from 172.30.32.2 on port 1883.
1624636374: Socket error on client <unknown>, disconnecting.
1624636494: New connection from 172.30.32.2 on port 1883.
1624636494: Socket error on client <unknown>, disconnecting.
1624636614: New connection from 172.30.32.2 on port 1883.
1624636614: Socket error on client <unknown>, disconnecting.
1624636734: New connection from 172.30.32.2 on port 1883.
1624636734: Socket error on client <unknown>, disconnecting.
1624636854: New connection from 172.30.32.2 on port 1883.
1624636854: Socket error on client <unknown>, disconnecting.
1624636974: New connection from 172.30.32.2 on port 1883.
1624636974: Socket error on client <unknown>, disconnecting.
1624637094: New connection from 172.30.32.2 on port 1883.
1624637094: Socket error on client <unknown>, disconnecting.
1624637214: New connection from 172.30.32.2 on port 1883.
1624637214: Socket error on client <unknown>, disconnecting.
1624637334: New connection from 172.30.32.2 on port 1883.
1624637334: Socket error on client <unknown>, disconnecting.
1624637454: New connection from 172.30.32.2 on port 1883.
1624637454: Socket error on client <unknown>, disconnecting.
1624637574: New connection from 172.30.32.2 on port 1883.

[diagonali]

Running supervisor-2021.06.6 and mosquito 6.0.1 still seeing these log spam

1624635774: New connection from 172.30.32.2 on port 1883.
1624635774: Socket error on client <unknown>, disconnecting.
1624635894: New connection from 172.30.32.2 on port 1883.
1624635894: Socket error on client <unknown>, disconnecting.
1624636014: New connection from 172.30.32.2 on port 1883.
1624636014: Socket error on client <unknown>, disconnecting.
1624636134: New connection from 172.30.32.2 on port 1883.
1624636134: Socket error on client <unknown>, disconnecting.
1624636254: New connection from 172.30.32.2 on port 1883.
1624636254: Socket error on client <unknown>, disconnecting.
1624636367: Saving in-memory database to /data/mosquitto.db.
1624636374: New connection from 172.30.32.2 on port 1883.
1624636374: Socket error on client <unknown>, disconnecting.
1624636494: New connection from 172.30.32.2 on port 1883.
1624636494: Socket error on client <unknown>, disconnecting.
1624636614: New connection from 172.30.32.2 on port 1883.
1624636614: Socket error on client <unknown>, disconnecting.
1624636734: New connection from 172.30.32.2 on port 1883.
1624636734: Socket error on client <unknown>, disconnecting.
1624636854: New connection from 172.30.32.2 on port 1883.
1624636854: Socket error on client <unknown>, disconnecting.
1624636974: New connection from 172.30.32.2 on port 1883.
1624636974: Socket error on client <unknown>, disconnecting.
1624637094: New connection from 172.30.32.2 on port 1883.
1624637094: Socket error on client <unknown>, disconnecting.
1624637214: New connection from 172.30.32.2 on port 1883.
1624637214: Socket error on client <unknown>, disconnecting.
1624637334: New connection from 172.30.32.2 on port 1883.
1624637334: Socket error on client <unknown>, disconnecting.
1624637454: New connection from 172.30.32.2 on port 1883.
1624637454: Socket error on client <unknown>, disconnecting.
1624637574: New connection from 172.30.32.2 on port 1883.

Same here. I think the explanation is that this is "normal" and can't be fixed since it's actually good and shows that the health checks are taking place. "Socket error" is actually a good thing! Apparently...