Lothar...
This changed in v15... Not in the UI at all any more.
They replaced struts with spring and the process is entirely different.
You copy the proper template from
SymantecDLP\Protect\tomcat\webapps\ProtectManager\security\springSecurityContext-KERBEROS.xml
Copy it To
SymantecDLP\Protect\tomcat\webapps\ProtectManager\WEB-INF\springSecurityContext-KERBEROS.xml
After moving it you rename it to just springSecurityContext.xml and replace the existing one.
You will need to update the krb5.ini location in the file to point to the right drectory..
restart Vontu Notifier..which will restart Vontu Manager as well.
Good Luck
Ronak
PLEASE MARKED SOLVED