SAP Plant Connectivity Security Policy Error

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Hello, 

I am Running SAP Plant Connectivity Version 15.5.4.39 as a OPC-UA Client and KEPServerEX 6 as an OPC-UA Server. I am now trying to connect them with a Secure Connection (Certificate, Baisc256ha256, SignAndEncrypt). I have done it successfully before however the tests before were on a System where both PCo and Kepware where on the same System. Now they are on seperate systems. PCo already has received the Certifiate from the Kepware Server and I have put it in the Trusted Certificate Folder. When I try to Connect them now I get the following Error: "Error Establishing a Connection: Error received from Remote Host: the security policy does not meet the requirements set by the server.". Guessing by the Displayed Error Message I would say that some Security Setting in my PCo Configuration is not right. However I have configured my Test System the same way that I have the two Systems now but I did not get the Error.

Thank you for Answers, 

Kind regards.