Azure Multi-Factor Authentication might be a bit more popular than OpenLDAP. We know about 2 links to it since March 2021 and only 2 links to OpenLDAP. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Honestly, the best docs are at openldap.org. I've read countless books and I don't think any of them are written well. I probably should write my own. Maybe when I retire :). Source: over 1 year ago
Zytrax has some decent ldap documentation, there's also some stuff at openldap.org. Source: almost 2 years ago
This is the answer, more detail: https://docs.microsoft.com/en-us/azure/active-directory/authentication/concept-mfa-howitworks. Source: about 2 years ago
Make sure that you back-up the active app-configuration, this way you have an easier way to recover; make sure you are allowed to verify using more than an authenticator, more here. Source: about 3 years ago
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Keycloak - Open Source Identity and Access Management for modern Applications and Services.
Authy - Best rated Two-Factor Authentication smartphone app for consumers, simplest 2fa Rest API for developers and a strong authentication platform for the enterprise.
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Duo Security - Duo Security provides cloud-based two-factor authentication. Duo’s technology can be deployed to protect users, data, and applications from breaches, credential theft, and account takeover.