You can see what is being sent by running a packet capture with a filter of port 88. Then look at the payload.
3.1.3. Generation of KRB_AS_REP Message
The authentication server looks up the client and server principals named in the KRB_AS_REQ in its database, extracting their respective keys. If the requested client principal named in the request is unknown because it doesn't exist in the KDC's principal database, then an error message with a KDC_ERR_C_PRINCIPAL_UNKNOWN is returned.
Imported Document ID: 000008544
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