Trouble for PI_OPClient's connection

Hi all

 

I faced to connection issue for PI_OPCClient.

 

I use this program for several years but I found OPC is not working some days ago.

 

Now, localhost is not connected to upper class.

I several times tried to connect to OPC servers but pausing the program.

-Network IP address is not duplicated.

 

In this case, what should I do to check something?

-now, I can't restart machine.

 

Best regards.