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Asked: 2026-05-23T21:09:21+00:00

I’m running the following tutorial: http://download.oracle.com/javase/6/docs/technotes/guides/security/jgss/tutorials/BasicClientServer.html I’m getting the following prompts: Connected to server

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I’m running the following tutorial:
http://download.oracle.com/javase/6/docs/technotes/guides/security/jgss/tutorials/BasicClientServer.html

I’m getting the following prompts:

Connected to server localhost/127.0.0.1
Kerberos username [login]: {I enter my username here}
Kerberos password for login: {I enter my password here}

I get the following error:

Can you ascertain the root cause of this?

Exception in thread "main" GSSException: No valid credentials provided (Mechanism level: Attempt to obtain new INITIATE credentials failed! (null))
at sun.security.jgss.krb5.Krb5InitCredential.getTgt(Krb5InitCredential.java:333)
at sun.security.jgss.krb5.Krb5InitCredential.getInstance(Krb5InitCredential.java:128)
at sun.security.jgss.krb5.Krb5MechFactory.getCredentialElement(Krb5MechFactory.java:106)
at sun.security.jgss.krb5.Krb5MechFactory.getMechanismContext(Krb5MechFactory.java:172)
at sun.security.jgss.GSSManagerImpl.getMechanismContext(GSSManagerImpl.java:209)
at sun.security.jgss.GSSContextImpl.initSecContext(GSSContextImpl.java:195)
at sun.security.jgss.GSSContextImpl.initSecContext(GSSContextImpl.java:162)
at demo.SampleClient.main(SampleClient.java:145)
Caused by: javax.security.auth.login.LoginException: Message stream modified (41)
at com.sun.security.auth.module.Krb5LoginModule.attemptAuthentication(Krb5LoginModule.java:696)
at com.sun.security.auth.module.Krb5LoginModule.login(Krb5LoginModule.java:542)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at javax.security.auth.login.LoginContext.invoke(LoginContext.java:769)
at javax.security.auth.login.LoginContext.access$000(LoginContext.java:186)
at javax.security.auth.login.LoginContext$5.run(LoginContext.java:706)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.login.LoginContext.invokeCreatorPriv(LoginContext.java:703)
at javax.security.auth.login.LoginContext.login(LoginContext.java:575)
at sun.security.jgss.GSSUtil.login(GSSUtil.java:246)
at sun.security.jgss.krb5.Krb5Util.getTicket(Krb5Util.java:136)
at sun.security.jgss.krb5.Krb5InitCredential$1.run(Krb5InitCredential.java:328)
at java.security.AccessController.doPrivileged(Native Method)
at sun.security.jgss.krb5.Krb5InitCredential.getTgt(Krb5InitCredential.java:325)
... 7 more
Caused by: KrbException: Message stream modified (41)
at sun.security.krb5.KrbKdcRep.check(KrbKdcRep.java:53)
at sun.security.krb5.KrbAsRep.<init>(KrbAsRep.java:96)
at sun.security.krb5.KrbAsReq.getReply(KrbAsReq.java:449)
at sun.security.krb5.Credentials.sendASRequest(Credentials.java:410)
at sun.security.krb5.Credentials.acquireTGT(Credentials.java:378)
at com.sun.security.auth.module.Krb5LoginModule.attemptAuthentication(Krb5LoginModule.java:662)
... 23 more
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1 Answer

  1. Editorial Team

    I’m wondering if this is a possibility (ie even if registry key is set, locked out for local administrators):

    http://cr.openjdk.java.net/~weijun/special/krb5winguide-2/raw_files/new/kwin

    Known Issues

    If an AD account is also added into local administrator group on the
    client PC, Microsoft restricts such client from getting the session key
    for tickets (even if you set the allowtgtsessionkey registry key to 1).
    The workaround is: Just forget you’re a logged in user, call kinit.exe.
    Do not depends on LSA credential cache.

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