How could I do that I can connect another linux computer(server) via OpenIGTLink?

I want to connect a robot arm using Slicer. I had already set up the ROS enviroment and installed ROS-IGT_bridge and everything I need. But when I use OpenIGTLinkIF module , and check the Active, the status is always “wait”. Am I right text the contents like this?

Hostname shown on the screenshot is invalid.

Make sure one of ROS-IGTL-bridge and Slicer is set up as server and the other as client.

Try to disable firewall temporarily to make sure it is not preventing network connections.