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OpenConnect RADIUS integration

Multi-Factor Authentication (MFA) is an extra layer of security used when logging into websites or apps. Individuals are authenticated through more than one required security and validation procedure that only they know or have access to.

OpenConnect is an open-source software application for connecting to virtual private networks (VPN), which implement secure point-to-point connections.

RADIUS is a protocol commonly used to authenticate, authorize, and account for user access and actions. Acceptto offers a simple solution for adding MFA to OpenConnect VPN via its Radius solution. This step-by-step integration instruction illustrates how to configure the OpenConnect VPN server and Acceptto RADIUS MFA authentication solution.


  • Acceptto RADIUS Agent that is configured and connected to your user directory. For example, Microsoft Active Directory (AD).

    For more information, see the Acceptto RADIUS deployment guide.

  • A user with administrative privileges on an OpenConnect server.

Configure the Acceptto RADIUS Agent

To integrate Acceptto with your OpenConnect server, you will need to install an Acceptto RADIUS Agent on a machine within your network. This server will receive RADIUS requests from your OpenConnect server, check with LDAP server to perform primary authentication, and then contact Acceptto cloud service for secondary authentication.

  1. Login to the Acceptto RADIUS Agent with an administrative user and open the radius-agent-config.env file with an editor. It is located in the installed directory of RADIUS Agent. RADIUS clients are configured in this setting.

    Acceptto RADIUS agent
  2. Go to the bottom of radius-agent-config.env file and change the ARA_CLIENTS attribute as follows. The values should be separated by semicolons (;)..

    ARA_CLIENTS = An optional name for your OCSERV; IP address of your OCSERV; a shared secret

    An example configuration might look like this:

    ARA_CLIENTS = VPN;;testing123

    ARA_CLIENTS configuration
  3. Save the file and run the following command to set changes:

    docker-compose down && docker-compose up -d

Configure your OpenConnect server

  1. Login to OCSERV server with administrative privilege.

  2. Open ocserv.conf with a text editor.

    sudo nano /etc/ocserv/ocserv.conf
  3. Comment all lines starting with "auth =". It should look like this:

    #auth = "pam"

    #auth = "pam[gid-min=1000]"

    #auth = "plain[passwd=./ocserv.passwd]"

    #auth = "certificate"

    #auth = "radius[config=/etc/radiusclient/radiusclient.conf,groupconfig=true]"

  4. Add a line as follows: auth = "radius [config=/usr/local/etc/radcli/radiusclient.conf,groupconfig=true]"

  5. If you need RADIUS accounting, add a line in the "Accounting methods available" Section: acct = "radius [config=/usr/local/etc/radcli/radiusclient.conf,groupconfig=true]"

  6. Save and exit.

  7. Run the following command for the changes to take effect.

    sudo systemctl restart ocserv
  8. Move to radcli etc folder and open radiusclient.conf with text editor.

    nano radiusclient.conf
  9. Configure radius settings according to your environment.

    nas-identifier “Enter name of your OCSERV” authserver “Enter Acceptto Radius Agent server IP”

    servers /etc/radcli/servers

    dictionary /etc/radcli/dictionary


    radius_timeout “60”

  10. Save and exit.

  11. Open servers file with text editor.

    nano servers
  12. Enter the Acceptto Radius Agent and secret like the following: testing 123

  13. Save and exit.

    Note: If you installed Acceptto Radius Agent and OCSERV on the same server, in the servers file you must enter the docker IP address of Acceptto Radius agent. This IP address can be find in the following command and screenshot:


Test Your Setup

Enter the OCSERV server address on the OpenConnect client and insert your username and password. You will receive a push notification on your It’sMe mobile application to authorize access to your VPN server.

FortiGate RADIUS its me


If you have questions or need assistance, contact SecureAuth Support.


Want to learn more about our MFA solutions? Contact our Professional Services for a demo today.


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