SAP stores certificates in PSE files (for the Java guys: JKS). By default, there are several PSEs available, one for each use case (system, SSL, web service, etc). A PSE has a subject which stands for the name of the server. Changes are good that the subject value created by SAP does not match your reality. The following steps show how to create a PSE for your SSL server. SAP Help
Change into edit mode:
Select the SSL Server PSE:
Right click to open the context menu and select replace
Give information about the new PSE. This creates a private and public key for the server CN informed for this PSE. The key will be automatically self-signed, but as the PSE contains the private key, it is no problem to create a certificate request and get the certificate signed by a CA.
The data informed here MUST match the data of the HTTPS server. The name field is the CN of the certificate; therefore this field MUST be the same as the FQDN of the server. That is, when the server is accessed by browsers as https://nwgw74.tobias.de, the field MUST be nwgw74.tobias.de.
Confirm the information. Make sure the CN name is correct. This changes the PSE for SSL Server.
You now have a PSE with a private and public key for the CN nwgw74.tobias.de. This certificate is self-signed. While you can now access ICF via HTTPS, each and every browser will give you a warning message that the certificate used is not trustworthy. To change that, a CSR must be created and signed by a CA.
You now have a PSE for the server nwgw74.tobias.de with a private key and a self-signed certificate.