OPC UA Services Connect the communication program

Hello, I’m from China.

Recently, when I used VC to connect to the OPC servers, VC had recognized the OPC servers, but when I entered the address to connect, an error was displayed. The error was shown in the figure below,

OPC version information:

National Instruments
OPC servers 2013

I have no idea. Bad memory? What are the specs of your PC?

I changed the OPCUA server software to Kepware, the problem of server connection has been solved.

The reason why I could not connect to OPCUA before, I think it might be the server setting problem, which should not be the reason of my computer.