2533937 - NTLM token received instead of SPNego token

SPNEGO web based authentication fails with the error

NTLM token received instead of SPNego token

 SPNego Authentication received unsupported NTLM Token You have configured the Kerberos library at this ABAP system to support "Simple and Protected GSSAPI Negotiation Mechanism" authentication (SPNego). However, an authentication token was received that conforms to the Microsoft NT LAN Manager (NTLM) format instead. Two common reasons for this are an incorrect browser configuration or problems with the mapping of Service Principal Name (SPN) to Service User at the Kerberos Key Distribution Center (KDC).

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Kerbersos, SAP Single Sign On, keytab, logon, password , KBA , BC-SEC-LGN , Authentication and SSO , BC-IAM-SSO-SL , Secure Login , Problem