Cu is using the Krb5LoginModule to login using cached TGT from the logged machine. The JAAS config file is configured as: Client { com.sun.security.auth.module.Krb5LoginModule required useTicketCache=true useKeyTab=false doNotPrompt=true renewTGT=true debug=true; }; and client code fails with the exception: That it did not retrieve TGT form the cache. The failure is shown in the following output: >>> Found no TGT's in LSA Principal is null null credentials from Ticket Cache [Krb5LoginModule] authentication failed Unable to obtain Principal Name for authentication javax.security.auth.login.LoginException: Unable to obtain Principal Name for authentication at com.sun.security.auth.module.Krb5LoginModule.promptForName(Krb5LoginModule.java:841) at com.sun.security.auth.module.Krb5LoginModule.attemptAuthentication(Krb5LoginModule.java:704) at com.sun.security.auth.module.Krb5LoginModule.login(Krb5LoginModule.java:617) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:497) at javax.security.auth.login.LoginContext.invoke(LoginContext.java:755) at javax.security.auth.login.LoginContext.access$000(LoginContext.java:195) at javax.security.auth.login.LoginContext$4.run(LoginContext.java:682) at javax.security.auth.login.LoginContext$4.run(LoginContext.java:680) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.login.LoginContext.invokePriv(LoginContext.java:680) at javax.security.auth.login.LoginContext.login(LoginContext.java:587) at com.wfs.platform.security.kerberos.Client.login(Client.java:102) at com.wfs.platform.security.kerberos.Client.main(Client.java:63) There was an error during the JAAS login This same code works with Java 6, but fails for Java 7 or 8.
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