OPC UA .net Server connect to Wincc Pro Client|OPC UA Standard|Forum|OPC Foundation

Hi, I'm trying to connect Wincc Pro V15.1 (siemens) to a sample server from opcfoundation github UA.NETstandard (the Quickstart Empty Server for instance) remotely.

What I have done is create a remote Virtual Machine, then run the Empty Server in that VM. Then the remote Server url is something like this: opc.tcp://52.255.171.136:62546. Set the "AutoAcceptUntrustedCertificates" in xml config file to "true".

Then in my local laptop, I have use a sample client/ UAExpert Client/ Prosys Client and test remote connection to that server, and all of them is successful.

The problem is, when I use Wincc Pro and create an OPC UA connection, it always shows this message: "Cannot resolve IP address opc.tcp://52.255.171.136:62546. Try computer name instead".
At first, I thought that my setting of Wincc does not allow the Wincc to connect with remote Server. But the problem is, my Wincc can connect to this server successfully: opc.tcp://opcuaserver.com:48010 (the demo opc ua weather server).

Have you ever faced this problem before?