OPC UA connection to a Fanuc Robot

Hello,

I am connecting to Fanuc Robots using OPC UA. I am able to connect to some of them and not to others. Everything that I've read online says that I should be able to connect to the 4 that have the required criteria; R553 Option, V9.1 or later, CD38A ethernet connection. Am I missing something obvious to connect to the 4 robots that meet all the criteria?
This is the hyperlink I have been using to connect to all the other robots.
opc.tcp://ip address:4880/FANUC/NanoUAServer
This is the error that I get when trying to connect through OPC UA to the 4 robots.
image
Any help or guidance that can be given would be greatly appreciated.

Thank you!

The error message says connection refused, which could be a wrong port number, IP address, or firewall blocking the traffic.

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What controller version? it has to be a R30I-B+ controller to support OPCUA. you can have a B controller that has v9.1 or higher and the R553 option but then it you would have to enable modbus In order to communicate with them using modbus TCP.