The Netweaver AS Java is configured for Kerberos Authentication. See the 7.00 specific documentation, Using Kerberos Authentication for Single Sign-On for more information about Kerberos Authentication in the AS Java but note that this Knowledge Based Article is relevant for all releases listed in the Environment area of this document
Kerberos authentication fails for some or all clients due to the browser sending a NTLM token and not a SPNego token which is required for successful authentication
SAP NetWeaver Application Server Java
SPNego Kerberos NTLM authentication header SPN service user token , KBA , BC-JAS-SEC-LGN , Logon, SSO , How To
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