error -unsupported format version number

[saratha]

Hello all,
            Wen I connect from client to kerberized server i got the following errors. 

 Trying 172.16.1.151...
Connected to radport.kovaiteam.com (172.16.1.151).
Escape character is '^]'.
[ Kerberos V5 refuses authentication because telnetd: krb5_rd_req failed: Unsupp
orted key table format version number ]
[ Kerberos V5 refuses authentication because telnetd: krb5_rd_req failed: Unsupp
orted key table format version number ]
Password for sara: Connection closed by foreign host.


here is my krb5.conf 

[logging]
 default = FILE:/var/log/krb5lib.log
 kdc = FILE:/var/log/krb5kdc.log
 admin_server = FILE:/var/log/kadmin.log

[libdefaults]
 ticket_lifetime = 24000
 default_realm = KOVAITEAM.COM
 dns_lookup_realm = false
 dns_lookup_kdc = false


[realms]
 KOVAITEAM.COM = {
  kdc = port.kovaiteam.com
  admin_server = port.kovaiteam.com:749
  default_domain = kovaiteam.com
 }

[domain_realm]
 .kovaiteam.com = KOVAITEAM.COM
 kovaiteam.com = KOVAITEAM.COM

[kdc]
 profile = /var/kerberos/krb5kdc/kdc.conf

[pam]
 debug = false
 ticket_lifetime = 36000
 renew_lifetime = 36000
 forwardable = true
 krb4_convert = false


what is the problem?

thanks
saratha
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