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Barracuda CloudGen Firewall

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Documentation for this product is no longer updated. Please see End-of-Support for CloudGen Firewall Firmware for further information on our EoS policy.

How to Configure Client Certificate Authentication for the SSL VPN

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The SSL VPN service supports authentication via client certificates either as the only authentication method, or in combination with user/password authentication. The client certificates must be installed on the client devices and can be used for the desktop and mobile portal as well as CudaLaunch on iOS and Android.

Before You Begin

Step 1. Import Root certificate for VPN service

Import the root certificate used to verify the client certificates. The certificate must be in PEM or CER format.

  1. Go to CONFIGURATION > Configuration Tree > Box > Virtual Servers > your virtual server > Assigned Services > VPN > VPN Settings
  2. Click Lock.
  3. Click on the Root Certificates tab.
  4. Right-click in the list and select Import PEM from File or Import CER from File depending on the format of your certificate file.
  5. Select the certificate on your disk. The Root Certificate window opens. 
  6. Enter a Name.
  7. Click OK
  8. Click Send Changes and Activate.

The root certificate is now listed in the Root Certificates tab.


Step 2. Configure Client Authentication for SSL VPN

Configure the SSL VPN to use client certificate authentication.

  1. Go to CONFIGURATION > Configuration Tree > Box > Virtual Servers > your virtual server > Assigned Services > VPN > SSL VPN
  2. Click Lock.
  3. In the left menu, expand the Configuration Mode section and click Switch to Advanced Mode.
  4. Set Use Client Certificate Authentication:
    • yes – Select to use client certificate authentication in addition to user/password authentication.
    • cert-only – Select to only use certificate authentication.
  5. Click + to add an entry to the Root Certificates list. The Root Certificates window opens.
  6. Enter a Name and click OK
  7. Select the root certificate you uploaded in Step 1 from the Client Root Certificate dropdown.
  8. (optional) Add Subject Restrictions to allow only client certificates matching these patterns to connect.
  9. Click OK.
  10. Click Send Changes and Activate.

Step 3. Restart the VPN Service

You must restart the VPN service for the changes to take effect.

  1. Go to CONTROL > Server.
  2. In the Service Status section select the VPN Service.
  3. Click Restart Service

You can now use client certificate authentication to log into the SSL VPN desktop and mobile portals as well as CudaLaunch.

Next Steps

Install the client certificates on your client devices. When used in combination with CudaLaunch, see How to Configure CudaLaunch for Mobile with Client Certificate Authentication.

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