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Opc Scout V10 Siemens Download 25

Hello, I have set up an OPC server for an S7-300 PLC using Step 7 v5.5 and Simatic NET.The connection seems fine, and I have access to all … but I cannot start the OPC Client (called OPC Server) in Simatic NET.
When I try to use the Open command, it says that the username and password do not match and cannot be correct.
I have User Administrator and Password Administrator on the PLC and they are secure.
I have tried adding / removing / changing users and password, but nothing changes.
On the command line, I have also tried manually entering the password and username.
But I cannot open the OPC server.