Problem after adding new realm in krb5.conf

[Sanket Sangodkar]

Hi,

We have configured SSO using Kerberos with Apache Http Server.
The realms name are defined in krb5.conf.
We needed to add one more domain to krb5.conf file -

We have inserted new realm as -
 xxx.xxx.COM = {
                kdc = <dns_name>
                admin_server = <dns_name>
        }

But after executing kinit command for respective domain xxx.xxx.COM it 
specifies follwing error message -
kinit: Client not found in Kerberos database while getting initial credentials

We wanted to know whether only specifying new name under [realm] content will 
add new domain/realm to Kerberos configuration.
Or are we missing any more configuration to add new realm ?

Regards,
Sanket