---
title: Access Server's Features Overview
canonical: https://openvpn.net/as-docs/access-server-features-overview/
product: Access Server Docs
---

# Access Server's Features Overview

- Access Server installs on a [Linux OS](https://openvpn.net/as-docs/system-requirements.md) with [installation options](https://openvpn.net/as-docs/get---install.md) to meet the needs of your network.
- VPN clients [connect](https://openvpn.net/as-docs/connecting.md) from Microsoft Windows, macOS, iOS, Android, and Linux systems.
- You can download installation packages for Linux, virtual machines, or cloud platforms.
- User [authentication](https://openvpn.net/as-docs/authenticating.md) includes a built-in system with web-based management or external authentication with PAM, LDAP, RADIUS, or SAML.
- Advanced authentication is supported through [custom programming](https://openvpn.net/as-docs/plugins.md) with Python.
- Access Server includes built-in, fully automated VPN certificate management and provisioning. External PKI is also possible for full control over an existing integrated PKI.
- VPN tunnels are secured with the OpenVPN protocol using TLS authentication, credentials, certificates, and MAC address lock (optional).
- Multi-factor authentication is supported in various forms: TOTP MFA is built-in; Duo Security can be added with a post\_auth plugin, and LastPass can be added with a post\_auth plugin.
- Access control rules can specify user or group access to IP addresses and subnets and allow or disallow direct VPN client connections.
- Full-tunnel and split-tunnel redirection: All VPN client internet traffic goes through the VPN tunnel or only specified traffic, respectively.
- The OpenVPN, Inc. team provides professional support through our online support ticket system, which is staffed by our global team of professionals.

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Prev: [What is Access Server?](https://openvpn.net/as-docs/what-is-access-server.md)
Next: [How To Sign Up](https://openvpn.net/as-docs/get-started-with-access-server.md)
Index: https://openvpn.net/as-docs/llms.txt