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mosquitto refuses connection sometimes [message #1838352]

Mon, 22 February 2021 19:00

Sven Schwarz

Messages: 2
Registered: February 2021

Junior Member

Hi together,

my mosquitto sometimes refuses connections.
I used the mosquitto_pub command to publish messages from another device.
This is working fine but sometimes I get "Error: Connection refused".
First I thought it is a client problem. So I tried the paho mqtt C client.
But the result is the same. Sometimes 10 out of 10 publishes are working but sometimes
with 4 or more of 10 I get "Connection refused".
So I think the problem is on the mosquitto side.

Any Ideas?
Help is very appreciated!

Regards
Sven

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Re: mosquitto refuses connection sometimes [message #1838437 is a reply to message #1838352]

Wed, 24 February 2021 23:00

Roger Light

Messages: 90
Registered: September 2013

Member

Hi Sven,

It's a bit difficult to say anything without more details. What version of Mosquitto are you using, and on what platform (Windows/Linux/...)? Does the problem go away by itself, or do you have to restart Mosquitto? Are the clients on a different computer to the broker? Is there anything interesting about the networking which could be causing the problem?

Regards,

Roger

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Re: mosquitto refuses connection sometimes [message #1838474 is a reply to message #1838437]

Thu, 25 February 2021 19:12

Sven Schwarz

Messages: 2
Registered: February 2021

Junior Member

Roger Light wrote on Thu, 25 February 2021 00:00

Hi Sven,

It's a bit difficult to say anything without more details. What version of Mosquitto are you using, and on what platform (Windows/Linux/...)? Does the problem go away by itself, or do you have to restart Mosquitto? Are the clients on a different computer to the broker? Is there anything interesting about the networking which could be causing the problem?

Regards,

Roger

Hi Roger,

thanks for your interest on my problem.
I know it's not much information by now so here more:

I run mosquitto on a raspberry pi running arch linux.
The problem goes away and comes back without any pattern.
I tried to set the shortest republish interval to something bigger than one or two minutes, since I was afraid the there where too much publishes from this node but that did not change anything.
It is possible that 8 of 10 messages work an 2 are denied, but also 8 of 10 denials are possible.
I tried to set the log type to debug to see more in the mosquitto log file. But there is nothing about the refused connections. I can see this only from the client side.
The client is connected via wifi to the network. I cannot see any problems there. My ssh connection to the client from my notebook is stable.

All my shelly devices work fine and I can't see any similar behavior there.
I use node-red to control all devices and this also is working without outages.

What's confusing me is, that I cannot reproduce these "refused connections" sending the same mosquitto_pub messages from my notebook. So it has to be a problem of this one client.
If the wifi connection was bad, I would expect to see a timeout before an error but the denial comes
immediately.

I'm running a bit out of ideas what else to try to analyse the problem.

Regards
Sven

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