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Barracuda CloudGen Firewall

How to Configure the SSL VPN Services for AWS Auto Scaling Clusters

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Let your users connect to a network in an AWS Auto Scaling cluster using SSL VPN. Enable the SSL VPN service and CudaLaunch, create a group access policy, and configure the login and authentication settings for the SSL VPN connections. To use SSL VPN, you must upload a certificate to the AWS certificate manager. For CudaLaunch on iOS, CloudGen Firewall Auto Scaling Clusters are supported for CudaLaunch 2.3.0 or higher.


Before You Begin

  • Configure an external authentication server or NGF local authentication. For more information, see Authentication.

Step 1. Disable Port 443 for Site-to-Site and Client-to-Site VPN 

  1. Go to CONFIGURATION > Configuration Tree > Box > Virtual Servers > your virtual server > Assigned Services > VPN > VPN Settings.
  2. Click Lock.
  3. Click the Click here for Server Settings link. The Server Settings window opens.
  4. Set Use Port 443 to No.
  5. Click OK.
  6. Click Send Changes and Activate.

Step 2. Configure SSL VPN General Service Settings

Enable the SSL VPN service and add the listening IP addresses.

  1. Go to CONFIGURATION > Configuration Tree > Box > Virtual Servers > your virtual server > Assigned Services > VPN-Service > SSL-VPN.
  2. Click Lock.
  3. Set Enable SSL VPN to Yes.

  4. (optional) Set Enable CudaLaunch to yes.
  5. Click + to add a Listen IP.

  6. Enter the IP address of the VPN service. E.g.,

  7. (recommended) Enable Restrict to Strong Ciphers Only.

  8. Select the Identification Type:
    • Generated-Certificate – The certificate and the private key is automatically created by the firewall.
    • Self-Signed-Certificate – Click New to create a Self-Signed Private Key and then Edit to create the Self-Signed Certificate.
    • External-Certificate – Click Ex/Import to import the CA-signed External Certificate and the External-Signed Private Key.
  9. Click Send Changes and Activate.

Step 3. Configure User Identity Access Control Policy

  1. Go to CONFIGURATION > Configuration Tree > Box > Virtual Servers > your virtual server > Assigned Service > VPN-Service > SSL-VPN.
  2. In the left menu, click Access Control Policies.
  3. Click Lock.
  4. Click + to add an Access Control Policy.
  5. Enter the Name for the access control policy.
  6. Click OK.
  7. In the Access Control Policy section, select the Active check box.
  8. In the Group Access section, click + to add Allowed Groups and Blocked Groups. Click x to remove the entry from the table.

    In Allowed Groups, either add an asterisk (*) to allow all groups, or enter one or more group names. Leaving the Allowed Groups empty causes the Access Control Policy to block all authentication attempts.
  9. In the Authentication section, click + to add an Authentication Scheme.
  10. Select Use Identity from the Authentication Scheme drop-down list.
  11. Click OK.
  12. Click Send Changes and Activate.

Step 4. Configure Login to Log In with User Identity

  1. Go to CONFIGURATION > Configuration Tree > Box > Virtual Servers > your virtual server > Assigned Services > VPN-Service > SSL-VPN.
  2. In the left menu, click Login.
  3. Click Lock.
  4. In the Login section, set the Identity Scheme to your preferred authentication method, e.g., MS-Active Directory.
  5. Click + to add your access control policy to the list of Access Control Policies.
  6. From the pop-up menu, select the access control policy that you configured in Step 3 for Use Identity, i.e., ACCE01.
  7. Configure the following settings:  
    • Use Max Concurrent Users – Set to no.
    • Session Timeout (m) – Set to 30. This setting must match with the timeout on the ELB.
  8. (optional) Customize the login messages and logos:   
    • Import a 200 x 66-pixel PNG or JPG image to customize the Logo.

    • Enter a plain text Login Message. E.g., Welcome to the Barracuda CloudGen Firewall SSL VPN.
    • Enter an HTML Help Text.
  9. Click Send Changes and Activate.

Step 5. (optional) Use Custom Cipher String

Configure a custom cipher string to be used by the SSL VPN service.

  1. Go to CONFIGURATION > Configuration Tree > Box > Virtual Servers > your virtual server > Assigned Services > VPN-Service > SSL-VPN.
  2. In the left menu, click Basic Setup.
  3. Click Lock.
  4. In the left menu, expand Configuration Mode and click on Switch to Advanced View.
  5. Disable Allow SSLv3.

  6. Enable Restrict to Strong Ciphers Only.

  7. Enter your custom SSL Cipher Spec string. 

  8. Set Strict SSL Security to yes.

    This setting might break access for some older client SSL implementation. Disable if you experience problems when using older browsers.

  9. Click Send Changes and Activate.

Step 5. Create Access Rules

Verify the the access rule CLOUD-SERVICE-VPN-ACCESS is present in the forwarding ruleset. If not, create the rule. Use the following settings:

  • Action – Select App Redirest.
  • Source – Select Any
  • Service – Select NGF-VPN-HTTPS.
  • Destination – Select the network object containing all firewall IPs.
  • Redirection – Enter the IP address of the VPN service. E.g.,



  • If the sslvpn log contains the following line: http_listener: failed to listen on <IP address>@443 verify that no other service on the firewall is running on that port and that no Dst NAT access rules are forwarding TCP port 443 (HTTPS) traffic.
  • Updating certificates requires the SSL VPN service to be restarted. To do this in an ASG, scale the ASG to a size of one. Then restart the VPN (SSL VPN) service. Then scale out, or wait for the scaling policies to scale your ASG out to the desired size.
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