Windows 2016 VPN Server not accepting connections

Mahesh Aralelemath 386 Reputation points
2020-08-16T17:49:40.827+00:00

Hi,
17777-rras.jpg
We are configuring 2 Windows 2016 Servers as VPN Servers behind Netscaler Load balancer. Observed that one of the server is not receiving request when tested one by one (keeping the other server down).
While both servers are identical in configuration, observed that one of the Server's name in RRAS console is displayed as "Servername(local)" while other server is not showing this and only shows the "Servername".
Could not understand this behavior and is there any issue in this?
Is this causing some issue in receiving the connections?
Both servers are in work group, having two NIC card (one for external facing and other NIC for internal facing) and not joined to Domain.
Attached the snapshot for reference.
Any support will be greatly appreciated.

Regards
Mahesh

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Accepted answer
  1. Gloria Gu 3,896 Reputation points
    2020-08-17T05:50:50.347+00:00

    Hi,

    In regards to your issue, here're my suggestions:

    1. The Server's name in RRAS console is displayed as "Servername(local)" is a normal phenomenon. It is the same in our own environment.
      17903-31.png
    2. After my research about Netscaler Load balancer, the normal work mode of LB is dynamic allocation of client request. That means even if one of VPN servers is down, the other will respond to the client's request. So the cause of the issue is on the LB device configuration.
      You can monitor the running(which you said not respond to request) VPN server in the LB device and see if there's any traffic from the client is blocked by the LB. Since the Netscaler Load balancer is a thrid-party application, please contact the application's support team to get more professional suggestions.

    -------If my answer is helpful to you, please remember to mark them as answer. Thank you!------

    Regards
    Gloria

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  1. Gloria Gu 3,896 Reputation points
    2020-08-18T02:40:10.757+00:00

    Hi,

    Windows LB is more suggested when configuring software LB. It refers to installing software on the server's operating system to achieve load balancing. Under your situation, it is better to install a load balancing hardware equipment.

    I would suggest you to first check if there's any log appeared in the LB device. Then, you can use Network Monitor to catch the network traffic package when client sending connection request to the LB and then to the VPN with problem. By analyzing the net package, it will show the problem is with VPN or LB.

    But I should apologize that the forum cannot offer technic support for net package analyzing, I would suggest you contact Microsoft Customer Support and Services where more in-depth investigation can be done so that you would get a more satisfying explanation and solution to this issue.
    Global Customer Service phone numbers
    https://support.microsoft.com/en-us/gp/customer-service-phone-numbers

    -------If my answer is helpful to you, please remember to mark them as answer. Thank you!------

    Regards
    Gloria