Added the Ikea dimmer to the nodes

What modules are your using, what is expected to be at 127.0.0.0.1? Are you using a ZigBee dongle to transmit between the node-red computer and the Ikea dimmer?

Your post lacks a lot of details. Which operating system is node red running on? Where are you seeing the 127.0.0.1 refused to connect message that you are seeing?