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Troubleshooting Authentication

Authentication issues may include inability to log in, unexpected logouts, or errors while using other authentication methods.

Troubleshooting Licensing

You might see license-related errors if you cannot connect to the WHMCS license server or there is a misconfiguration in your system.

Two-Factor Authentication

Two-Factor Authentication (2FA) enhances security by requiring both a password and a second step like a login code from a mobile device.

Duo® Security

Duo® Security is a two-factor authentication (2FA) option that combines traditional account credentials with device-based verification.

Reset a User Password

Initiate a password reset for a user who has lost their Client Area password. Users can also initiate password resets on the login form.


API Credentials

API authentication credentials allow your API-connected devices and systems to authenticate with WHMCS using API roles that you create.

Single Sign-On

Single Sign-On allows users to log in to a cPanel & WHM or Plesk hosting account directly from a link in WHMCS without reauthenticating.

Application Links

Application Links use WHMCS Single Sign-On to allow users to seamlessly access WHMCS from the cPanel & WHM control panel.

Sign-In Integrations

Sign-in integrations allow customers to connect with our supported platforms — Facebook®, Google®, or X™ (formerly Twitter™) — to quickly sign up or log in to WHMCS.

OpenID Connect

OpenID Connect is the online standard for Single Sign-On and identity provisioning. It uses JSON-based identity tokens (JWT) and OAuth 2.0.

OpenID Connect Development

OpenID Connect uses JSON-based identity tokens (JWT) and OAuth 2.0 to allow third-party applications to access WHMCS with Single Sign-On.







Login Session Length

You can adjust the login session length for admins and users on self-hosted WHMCS installations. WHMCS will automatically end login sessions after the set period of inactivity.