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https://issues.apache.org/jira/browse/DIRKRB-91?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13634239#comment-13634239
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Steve Moyer commented on DIRKRB-91:
-----------------------------------

 I found a thread that describes the AS_REP containing an EncTgsRepPart at 
http://kerberos.996246.n3.nabble.com/HELP-invalid-AS-REP-from-Linux-running-MIT-Kerberos-V5-td14527.html
 and there's a reference to RFC 4120, Section 5.4.2.  The pertinent paragraph 
is (quote):

Compatibility note: Some implementations unconditionally send an encrypted 
EncTGSRepPart (application tag number 26) in this field regardless of whether 
the reply is a AS-REP or a TGS-REP.  In the interest of compatibility, 
implementors MAY relax the check on the tag number of the decrypted ENC-PART.

So apparently, it's widely known that (at least) the MIT Kerberos server has 
this behavior.
                
> Problems decrypting the TGT in KerberosConnection
> -------------------------------------------------
>
>                 Key: DIRKRB-91
>                 URL: https://issues.apache.org/jira/browse/DIRKRB-91
>             Project: Directory Kerberos
>          Issue Type: Bug
>            Reporter: Steve Moyer
>            Assignee: Emmanuel Lecharny
>         Attachments: AuthReqAndRep
>
>
> See attached packet dumps (libpcap) of the request and response.

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