> For the complete documentation index, see [llms.txt](https://docs.parallels.com/landing/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.parallels.com/landing/ras-admin-guide/v19-en-us/parallels-ras-19-administrators-guide/connection-and-authentication-settings/multi-factor-authentication.md).

# Multi-factor authentication

Parallels RAS allows you to use multi-factor authentication for access control. When multi-factor authentication is used, users will have to authenticate through two successive stages to get the application list. While the first level will always use native authentication (Active Directory / LDAP), the second level can use one of the following solutions:

* [RADIUS](/landing/ras-admin-guide/v19-en-us/parallels-ras-19-administrators-guide/connection-and-authentication-settings/multi-factor-authentication/using-radius.md)
  * Azure MFA (RADIUS)
  * Duo (RADIUS)
  * FortiAuthenticator (RADIUS)
  * TekRADIUS
  * RADIUS
* [TOTP](/landing/ras-admin-guide/v19-en-us/parallels-ras-19-administrators-guide/connection-and-authentication-settings/multi-factor-authentication/using-totp.md)
  * Google Authenticator
  * Microsoft Authenticator
  * TOTP (Time-based one-time password)
* [Email OTP](/landing/ras-admin-guide/v19-en-us/parallels-ras-19-administrators-guide/connection-and-authentication-settings/multi-factor-authentication/configuring-email-otp.md)
* [Deepnet](/landing/ras-admin-guide/v19-en-us/parallels-ras-19-administrators-guide/connection-and-authentication-settings/multi-factor-authentication/using-deepnet-dualshield.md)
* [SafeNet](/landing/ras-admin-guide/v19-en-us/parallels-ras-19-administrators-guide/connection-and-authentication-settings/multi-factor-authentication/using-safenet.md)

Multi-factor authentication is more secure because instead of using a standard user name and password, it uses a static user name and a one-time password generated by a token.

Learn how to add an MFA provider in the [**Adding an MFA provider**](/landing/ras-admin-guide/v19-en-us/parallels-ras-19-administrators-guide/connection-and-authentication-settings/multi-factor-authentication/adding-an-mfa-provider.md) section.

See also [**Configuring MFA rules**](/landing/ras-admin-guide/v19-en-us/parallels-ras-19-administrators-guide/connection-and-authentication-settings/multi-factor-authentication/configuring-mfa-rules.md).


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