telnetd: Authorization failed. -- [Any kerberos - telnetd setup tutorial ?]

[vj]

packet capture error details :
KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN
sname in all KRB-ERROR AND TGS-REQ is  : krbtgt

I dont see other service principal other than
krbtgt/sxlinux.company.... at sxlinux.company.com....
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