how to validate user credentials on service portal login page in servicenow o

[Arjun Reddy Yer]

how to validate user credentials on service portal login page in servicenow as when ever user tries to login into the instance it should validate credentials of the user. If the user enters wrong credentials then it should through error message and should not allow user to access the instance. @Ankur Bawiskar @Mohith Devatte @Sandeep Dutta @Chuck Tomasi @Allen Andreas 

[Ankur Bawiskar]

Hi,

Are you seeing any weird changes in OOB? This should happen by default

Regards
Ankur

[Arjun Reddy Yer]

as I need to create it from scratch so required guidance to build it.