SPNEGO based SSO has been configured for JAVA server, after upgrading OS, SSO failed.
In TSHW trace, following error is observed:
SPNEGORealm: <YOUR AD SERVICE ACCOUNT>
User mapping: SPNEGOUserMapping: mode = XXXXl,XXXX, source = XXX
Default user groups: 
Default user roles: 
SPNEGOKey: code = 17, type = aes128-cts-hmac-sha1-96
SPNEGOKey: code = 3, type = des-cbc-md5
SPNEGOKey: code = 23, type = rc4-hmac
com.sap.security.core.server.jaas.SPNegoLoginModule OPTIONAL ok exception true Could not validate SPNEGO token. Reason: Illegal key size
- Netweaver Application Server Java
- Microsoft Active Directory Service
SPNego, JVM, JAVA system, portal, ntlm , KBA , BC-JAS-SEC-LGN , Logon, SSO , Problem
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