Network Setup Example 4: Kerberos KDC, Multiple Realms

For this example:

  • The Bomgar Appliance may or may not be located behind a corporate firewall.
  • Representatives may or may not be on the same network as the Bomgar Appliance.
  • Representatives may belong as members of multiple Kerberos realms existing in the corporate infrastructure (traditionally, a multi-domain hierarchy in Windows).
  • If a DMZ realm exists, the representatives' realms may have inbound trusts with that DMZ realm, allowing principals in the trusted realms to obtain tickets for services in the DMZ realm.



  1. Register one or more of the SPNs according to the following rules:
    • If a DMZ Kerberos realm is involved, register a unique SPN within the DMZ realm.
    • If no DMZ Kerberos realm is involved and no trust exists between the two realms, register a unique SPN in each realm.
    • If no DMZ Kerberos realm is involved and trust exists between the two realms, register a unique SPN in a realm of your choosing.
  2. Export all registered SPNs.

Users & Security > Kerberos Keytab
Kerberos Keytab

  1. Log into your Bomgar Appliance's /login interface.
  1. Go to Users & Security > Kerberos Keytab.
  2. Under Import Keytab, browse to the exported keytab and then click Upload. You should now see this SPN under the list of Configured Principals.
  1. Repeat the previous step for each exported keytab.


Users & Security > Security Providers
Security Provider Configuration Page

  1. Go to Users & Security > Security Providers. From the dropdown, select Kerberos. Then click Create Provider.
  2. Create a unique name to help identify this provider.
  3. Be sure to check the Enabled box.
  4. Choose if you want to synchronize display names.
  5. Optionally, select to remove the REALM portion from the User Principal Name when constructing the Bomgar username.
  1. If using a DMZ realm or using the same SPN for multiple realms, you will want to match on user principle name to identify users from the first realm.
  2. If you registered multiple SPNs, choose the SPN that users from the first realm will use.
  3. You may also select a default group policy for users who authenticate against this Kerberos server.
  4. Click Save Changes to save this security provider configuration.
  5. Repeat steps 7 through 15 for each realm from which users will authenticate, substituting the UPN or SPN rule for each realm as appropriate.