How to Configure NTLM Authentication

Integrate the Barracuda NextGen Firewall X-Series with your NT LAN Manager (NTLM) authentication server to authenticate NTLM domain users via their Microsoft Windows credentials. To enable transparent authentication against your NTLM server, join the X-Series Firewall to the NTLM domain as an authorized host.

Step 1. Configure NTLM Authentication

1. Go to the USERS > External Authentication page.

2. Click the NTLM tab.

3. Enter the NTLM/Kerberos realm name in the Domain Realm field.

   Always enter the Domain Realm in uppercase letters. E.g., MYDOMAIN.COM

4. Enter the Netbios Domain Name.
   

5. (Optional) Enter the MS Active Directory Workgroup Name.

6. In the Domain Controller field, enter the hostname or IP address of the domain controller.

   The hostname must be DNS resolvable.

7. (Optional) Enter the hostname of the domain's Windows Internet Name Service server in the WINS Servers field.

8. Select the authentication scheme to retrieve group information from.
   
   
   

9. Click Save.

The configuration is now added to the EXISTING AUTHENTICATION SERVICES table.

Step 2. Join the X-Series Firewall to the Domain

Join the X-Series Firewall to the NTLM domain as an authorized host.

1. Go to the USERS > External Authentication page.
2. Click the NTLM tab.
3. Enter the Windows Domain Username.
4. Enter the Windows Domain Password.
5. Click Save.
6. Click Join Domain.

You can check the status of the domain registration by clicking Registration Status.

Your NTLM domain users can now authenticate on the X-Series Firewall using their Microsoft Windows credentials.