Unable to access the index

[msplunk33]

I have created a role and provided the access to indexes for a user. However the user can not search on the index. Other user can search. This user is in 3 other roles also. How can I troubleshoot. In which log I can check for access related log.

[to4kawa]

| rest /services/authentication/users 
    : check user role

| rest /services/authorization/roles
    :check srchIndexesAllowed