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Home » Newcomers » Newcomers » Client <unknown> disconnected: Unknown error.(Error being logged by broker (MQTT v5 Versions 2.0.11 installed on Windows Server) for clients that tries to reconnect after being disconnected. )
Client <unknown> disconnected: Unknown error. [message #1852134] Mon, 02 May 2022 04:44 Go to next message
Gaurav Kumar is currently offline Gaurav KumarFriend
Messages: 3
Registered: May 2022
Junior Member
I am experiencing an issue wherein the MQTT broker rejects clients request for reconnection with the below error message in the log file

2022-04-20T00:03:21: New connection from 12.435.3.657:42494 on port 8883.
2022-04-20T00:03:21: Client disconnected: Unknown error.

Here 12.435.3.657 (masked) is the clients IP address. Initially, when the MQTT client starts it connects to the broker fine. Afterwards, the client reconnects successfully for some time before the broker starts showing the error. Thereafter, the client keeps on retrying and is unsuccessful . As clear in the error message the connection request is to the secured port ( 'tlsv1.2' ).

I am unable to find the cause for this issue and is unable to replicate it. Also, I am unaware how to capture details for this error as setting 'log_type' to all in broker config yields the same error message.

Would appreciate help on this issue.
Thanks.
Re: Client <unknown> disconnected: Unknown error. [message #1852136 is a reply to message #1852134] Mon, 02 May 2022 07:08 Go to previous messageGo to next message
Ed Merks is currently offline Ed MerksFriend
Messages: 32506
Registered: July 2009
Senior Member
It's probably better to ask here:

https://www.eclipse.org/forums/index.php?t=thread&frm_id=270


Ed Merks
Professional Support: https://www.macromodeling.com/
Re: Client <unknown> disconnected: Unknown error. [message #1852142 is a reply to message #1852136] Mon, 02 May 2022 13:27 Go to previous message
Gaurav Kumar is currently offline Gaurav KumarFriend
Messages: 3
Registered: May 2022
Junior Member
I have posted it under Mosquitto forums now. Link below:

https://www.eclipse.org/forums/index.php/m/1852141/?srch=Client+%3Cunknown%3E+disconnected%3A+Unknown+error.#msg_1852141

Thanks.
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