Oops! Access Denied ErrorsTroubleshoot and resolve Oops! Access Denied - Forbidden errors while logging in to WHMCS.
Oops! Too Many Requests ErrorsTroubleshoot and resolve Oops! You have sent too many requests errors while logging in to WHMCS.
PHP Session Storage ErrorsTroubleshoot and resolve `PHP session storage is not writeable. For help, contact your system administrator.` errors when logging in to the WHMCS Admin Area.
Single Sign-On Active Session ErrorsTroubleshoot and resolve `OAuth authorization request denied due to unexpected active login session for 'Closed' User ID` errors.
Single Sign-On Closed User ErrorsTroubleshoot and resolve `Single Sign-On authentication denied for 'Closed' User ID` errors when attempting to use WHMCS single sign-on.
Single Sign-On Configuration ErrorsTroubleshoot and resolve `Single Sign-On authentication denied per configuration for User ID` errors when single sign-on is disabled.
Single Sign-On Token ErrorsTroubleshoot and resolve `Unable to authenticate with Single Sign-On token for User ID` errors during WHMCS single sign-on.
Enable 2FA GloballyBefore you can enable two-factor authentication (2FA) for users or admins, you must enable it globally for your WHMCS installation.
Enable 2FA for AdminsConfigure two-factor authentication (2FA) for Admin Area logins. 2FA enhances security by adding a second step to the login process.
Enable 2FA for ClientsConfigure two-factor authentication (2FA) for Client Area logins. 2FA enhances security by adding a second step to the login process.
Log In Without a Backup CodeYou can restore access to the Admin Area or Client Area after the loss of a two-factor authentication (2FA) device and backup code.
Log In Without a TokenIf users or admins lose their two-factor authentication (2FA) device, they can regain access to WHMCS using their 2FA backup code.
Require 2FAAfter you enable two-factor authentication (2FA), you can require users and admins to configure it the next time that they log in to WHMCS.
Sign In Using FacebookFacebook® Sign-In Integrations let your customers register, sign in, and connect with your WHMCS installation.
Sign In Using GoogleGoogle® Sign-In Integrations let your customers register, sign in, and connect with your WHMCS installation.
Sign In Using TwitterTwitter™ Sign-In Integrations let your customers register, sign in, and connect with your WHMCS installation.