After uploading the keytab file, you will be redirected to the Kerberos Authentication Test page.
If you are lucky, this test will succeed on your first try:
In many situation you will have to prepare the browser(s) used in your organization to allow the Kerberos ticket to be sent to your site (for example https://wiki.example.com). For more details on configuring Zone settings, and configuring Chrome and Firefox on Windows, Mac, and Linux, see our Browser Configuration Guide.