Kerberos error when using integrated authentication

I am getting following error when I authenticate a web page in IIS 6.0 :

Msg Type : KRB-ERROR (30) erro开发者_运维技巧r-code : KRB5KRB_AP_ERR_MODIFIED

can someone please suggest what could be wrong?

I did not really want to use kerberos, but it was just holding me down. Anyway, figured out how to prevent this error. I simply disabled Negotiate in IIS server setting for the website. Chaged it from "negotiate, NTLM" to only "NTLM".

It uses NTLM now, which is fine for me.