AP_REQ Authenticator Checksum

Prashant Batra Prashant.Batra at citrix.com
Tue Jul 26 14:52:46 EDT 2011


Hi Guys,

Need some help on an AP_REQ packet. I am working on a MAPI client and we use Kerberos for our initial authentication. After successfully getting a TGT and TGS, I am sending an AP_REQ to the server, where I get a DCERPC fault saying - Invalid Checksum.
So I guess that means that the Checksum in my Authenticator is incorrectly formed (actually I am sending a NULL Checksum). Can someone guide me on what this Checksum is supposed to be? Exactly what data is used to compute this checksum? Note that the negotiated encryption type is RC4-HMAC.

All help is appreciated...

Thanks,
Prashant



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