In IPA AD trust setup, user kerberos tickets are generate in Upper-Case resulting file permission issues.

Issue

In IPA AD trust setup, user kerberos tickets are generate in Upper-Case resulting file permission issues.

Upon successful user login , I see the following.

klist
Ticket cache: FILE:/tmp/krb5cc_262517666_ojlWfN
Default principal: AD_USER@PROD.EXAMPLE.COM.AU

Valid starting       Expires              Service principal
12/09/2016 16:56:29  12/10/2016 02:56:29  krbtgt/PROD.EXAMPLE.COM.AU@PROD.EXAMPLE.COM.AU
        renew until 12/16/2016 16:56:29

However file permissions are set based on lower-case user name.

drwxr-xr-x   - ad_user  ad_user               0 2016-12-09 16:59 /user/ad_user

How can we change the kerberos credentials to lower case so users can access their home directories ?