OPC UA C# Server only run locally|OPC UA Standard|Forum|OPC Foundation

Hi, I have write a simple OPC UA Server based on a sample project from OPCFoundation Github.

Also, I use Prosys OPC UA Client to test the Server.

The problem is, when I run the C# Server and Prosys Client in the same device, they can connect normally, however when they are running in different PCs, it’s an error (I captured and posted it in the drive below)

This is my project: OPC UA Server

if possible, can you check and tell me my mistake?

Thank you.