kerberos apache sso "failed to verify krb5 credentials: Bad encryptio"

[dream4soul]

Hi all,

I need preform apache auth using AD kerberos.

so my conf now ubuntu 10.10:


client auth works well

$ kinit username






but apache !!! "failed to verify krb5 credentials: Bad encryption type" the url of http page



[Mon Feb 14 14:18:38 2011] [error] [client 192.168.53.143] failed to verify krb5 credentials: Bad encryption type



I know that is encryption problem but where to fix ???