Unable to login with integration

I am trying to integrate the ubuntu to ucs Ad from the following document
http://docs.software-univention.de/domain-4.1.html17

In ths Document i have completed the following topics

Integration into the LDAP directory and the SSL certificate authorityConfiguration of the System Security Services Daemon (SSSD)Configuring user loginsKerberos integration

When Iam trying to Login It was showing Error Like Invalid Credentials

Regards,
Jude Jerome

What steps - beside trying to login - did you take to verify the success of the configuration?
Also: what Ubuntu-Version was used?