Thanks. I played with it a little bit this morning. I’m far from very knowledgeable in this area - but ignition doesn’t seem to use port 2222 to connect with the PCCC protocol. I turned on firewall logging, and the server was connecting to port 44818 on the AB MicroLogixs. With the EIP protocol it was also connecting to 44818.
And actually to make things more complicated - I do have a SLC that connects successfully via the “direct” protocol using port 2222. So, I break that connection if I block 2222.