1689432 - Producer Registration fails with SPNEGO enabled in Login modules

Registering the Producer portal fails with the following error message when using SPNEGO authentication in the login module.

Could not register your portal although access to WSDL file was successful. Possible reasons: producer server is down, network problems, or incorrect registration parameters.

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• EP Release Independent
• SAP NetWeaver
• SAP Composition Environment

SAP NetWeaver 7.0 ; SAP NetWeaver 7.3 ; SAP NetWeaver 7.4 ; SAP NetWeaver 7.5 ; SAP enhancement package 1 for SAP NetWeaver 7.0 ; SAP enhancement package 1 for SAP NetWeaver 7.3 ; SAP enhancement package 2 for SAP NetWeaver 7.0

Enterprise Portal 7.0, EP 7.0, Enterprise Portal 7.01, EP 7.01, Enterprise Portal 7.02, EP 7.02, Enterprise Portal 7.03, EP 7.03, Enterprise Portal 7.1, EP 7.1, Enterprise Portal 7.2, EP 7.2, Enterprise Portal 7.30, EP 7.30, Enterprise Portal 7.31, EP 7.31, Enterprise Portal 7.40, EP 7.4, Enterprise Portal 7.50, EP 7.5,SPNEGO, LoginModule, WSDL, Could not register your portal although access to WSDL file was successful,  producer server is down, network problems, or incorrect registration parameters, Register, fail, FPN, response 401, kerberos, RDL, RRA , KBA , EP-PIN-FPN , Federated Portal Network , BC-JAS-SEC , Security, User Management , Problem