Fail to connect to the MQTT broker – RAK7240

Issue: My gateway (RAK7240) can’t connect to the MQTT broker of our server, even though I set it up with the same configuration as the other gateways that I have from another manufacturer.

Setup: RAK7240 as packet forwarder, using the protocol MQTT for ChirpStack 3.x (PROTOBUF)

LoRa® Server: ChirpStack

Details:
This is the set up in the RAK gateway:

This is the set up in on of my other gateways (IMST Lite Gateway, based on rpi):

This is the error that I get on the logs of the RAK:
image

Any tip or suggestion would be highly appreciated given that I have been stuck for several days now, so thanks in advance!

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