Unable to authenticate MS AD users for SSL VPN Connection 5

manjum58 Lv1Posted Mar-04-2022 17:19


Hi there,
My NGAF SSLVPN is working perfect with users present in local DB of NGAF, also imported MS Active Directory Users successfully. while trying to connect VPN via MS AD user, Easy Connect always gives error "username or password is incorrect" seems it is unable to authenticate via AD. My AD is authenticating users for other purposes within LAN only VPN users are having issues.

Is there any recommendation or prerequisite configuration needs to be done on Active Directory side or may be on NGAF site.

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Good day! Could you test the AD validity? Is it valid?
Kindly check whether the user's username appear in the SSLVPN Users, if yes, we appreciate if you could show us the user details screenshot by clicking the user.
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Newbie490784 Posted May-05-2025 16:51
  
It sounds like you're facing an authentication issue when trying to use Microsoft Active Directory (MS AD) credentials to authenticate VPN users on your NGAF SSL VPN. Here are a few recommendations and checks you can consider:
1. Check Active Directory Configuration on NGAF:

  • Ensure the AD integration is set up correctly: Double-check that NGAF is properly connected to the Active Directory. Ensure that the correct domain controller is specified, and that NGAF has the right permissions to access the AD.

  • AD server settings: Verify that NGAF is using the correct port (typically 389 for non-SSL or 636 for SSL) to communicate with AD. Also, ensure that the server address for AD is correct.


2. Test AD Authentication Locally:

  • Test AD Credentials: Make sure that you can log in to the VPN with the same MS AD credentials from a local machine that is joined to the domain. This will help verify that the AD integration is generally working.

  • Account Lockout Policies: Check if the AD account might have been locked due to failed login attempts or security policies like account lockout thresholds.


3. Check NGAF SSL VPN Configuration:

  • Authentication Method: Confirm that NGAF is set to use MS AD for user authentication. Sometimes, NGAF might be set to use local database authentication, which can be manually changed in the settings.

  • Groups and Permissions: Ensure that the MS AD users or groups are correctly mapped to the VPN profiles or permissions in NGAF. The VPN policy should allow these users/groups to authenticate and access the VPN.

  • User Mapping: Make sure that the usernames in the AD are mapped correctly to what NGAF expects. There may be issues with how NGAF is interpreting or formatting the usernames.


4. Check for Network Issues:

  • Network Reachability: Verify that the NGAF device can reach the AD server on the required ports. If there’s a firewall or network issue between the NGAF and AD server, this might prevent successful authentication.

  • DNS Resolution: Ensure that the DNS settings on the NGAF are configured correctly so it can resolve the domain name of the AD server.


5. Check SSLVPN Logs:

  • Review Logs on NGAF: Check the SSL VPN logs on NGAF to see if there are any specific errors related to AD authentication. This can provide more specific details about what’s failing during the login attempt.


6. Active Directory Prerequisites:

  • Time Sync: Ensure that the NGAF device and the Active Directory server have synchronized system times. Kerberos authentication (if used) is sensitive to time discrepancies.

  • Enable NTLM or Kerberos Authentication: Depending on how your VPN is configured to authenticate, ensure that NTLM or Kerberos authentication is enabled on both the AD server and NGAF.

  • Firewall Rules for AD Ports: Ensure that the necessary firewall ports for AD authentication (such as 389, 636, and 3268) are open and not being blocked by any firewalls.


By following these steps, you should be able to narrow down the issue and fix the AD authentication problem for your NGAF SSL VPN.
Humayun Ahmed Lv3Posted Jan-14-2025 15:51
  
Thanks to share.
Newbie911490 Lv1Posted Aug-10-2024 02:55
  
It sounds like you're dealing with a common issue where the NGAF SSL VPN isn't properly authenticating Microsoft Active Directory (AD) users. Here's a detailed guide to help you resolve this problem:

1. Verify AD Integration:
LDAP Configuration: Double-check the LDAP settings on your NGAF. Ensure that you’ve correctly entered the AD server's domain name, IP address, and port. Most commonly, LDAP uses port 389, and LDAPS (secure LDAP) uses port 636.
Binding Test: Perform an LDAP bind test to ensure that the NGAF can connect to the AD server and successfully search for users.
2. User Attribute Validation:
Active Accounts: Ensure that the AD accounts are active, not locked out, and that passwords haven’t expired. AD authentication can fail if the user’s password is expired or if the account is locked.
Correct Group Membership: If your VPN setup uses AD group membership to authorize users, ensure the users are part of the correct groups within AD.
3. NGAF SSL VPN Configuration:
Authentication Method: Confirm that the NGAF is set up to use AD/LDAP for authenticating VPN users, not just the local database.
Certificate Trust: If using LDAPS, verify that the NGAF trusts the certificate provided by the AD server. Issues here often cause authentication to fail.
4. Logs and Troubleshooting:
Check Logs: Both the NGAF and AD logs will provide clues. On the NGAF, look for LDAP-related errors or warnings. On the AD server, check for any failed login attempts or LDAP errors.
Firewall and Network Configuration: Ensure there are no firewall rules or network configurations blocking the LDAP ports (389/636) between NGAF and the AD server.
5. Consider External Resources:
If after following these steps you're still facing issues, you might want to explore further or even look into professional services that specialize in network security and Active Directory integration. Sometimes, the solution lies in subtle misconfigurations that require a deeper dive.

Additionally, if you're involved in network security or other technical areas, and you're looking to boost your online presence or expand your reach, I recommend checking out <a href="https://instauppro.com/"> InstaupPro.com</a>. It offers great tools and insights for improving your digital footprint, which can be particularly valuable if you're managing or promoting a tech-related website.

Newbie916020 Posted Mar-04-2024 03:48
  
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Newbie414472 Posted Mar-04-2023 22:00
  
i also face network connections issue's
Newbie414472 Posted Mar-04-2023 18:13
  
it's very informative & it helps me a lot. recommended.
moleculep heasa Posted Sep-22-2022 13:01
  
No necessary Active Directory configuration is required. Simply verify the WAN Links and attempt to delete and recreate the user.
kmrnliaqat Lv3Posted Jun-01-2022 18:25
  
informative ..
ArsalanAli Lv3Posted May-27-2022 21:33
  
No, there no prerequisite configuration on Active Directory needed. Just check the WAN Links and Try to remove and Recrate User

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