3559673 - Special user name which contains special national characters e.g. "ß" can't logon with Basic Authentication

• An issue arises when attempting to log in using Basic Authentication in the system for testing e.g., ODATA or SOAP services.
• The issue appears to be user-dependent, with certain users unable to authenticate.
• Specifically, users with special national characters, such as "ß", in their usernames or passwords are unable to authenticate.
• When attempting to authenticate, the system returns an HTTP error 401, despite correct login data.
• The system delivers an HTML page with the text "401 Not authorized" and denies access.

• SAP NetWeaver
• SAP NetWeaver Application Server for SAP S/4HANA
• ABAP PLATFORM - Application Server ABAP

SAP ICF, ODATA, SOAP APIs, Basic Authentication, special characters, HTTP error 401, username, authentication failure, SAML2, ISO-8859-1, national characters, German, logon, basic logon, 7-bit ASCII, basic logon procedure, ICF, Internet Communication Framework, SICF, Service, Services, ICF service, ICF_GDPR. , KBA , BC-MID-ICF , Internet Communication Framework , BC-CST , Client/Server Technology , BC-SEC-LGN , Authentication , Problem