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[broadstairs]

Hope this is the righg place! I have discovered that several devices I have are using MQTT to call home. I want to prevent this is there any easy way to do this?

Stuart

[tubaman]

A quick search suggests the standard ports used by MQTT are 1883 for unencrypted comms and 8883 for encrypted comms, but if you block those ports entirely you may find that some devices stop working correctly.

[broadstairs]

A quick search suggests the standard ports used by MQTT are 1883 for unencrypted comms and 8883 for encrypted comms, but if you block those ports entirely you may find that some devices stop working correctly.

Yes I found that and neither of those were active but my suspicion is that they are only opened to communicate and then closed again. I have a Vodafone router which only allows UPNP to be turned off no individual ports and I need this for my digital home phone. I also found MQTT can use port 443 (I think that's the number). I checked all those ports with Shields Up and they were stealth!

Stuart

[tubaman]

Port 443 is usually for HTTPS but I suppose they could be using it for a different purpose. Shields Up checks that the ports can't be seen with a probe from outside but as you say it's likely they are opened and then closed again. What is your actual concern here as a lot of IOT devices call home on a regular basis?

[Alex Atkin UK]

Are they even opened at all?  More likely they are connecting from the inside out, no port opening required.