MFA solutions for Windows Server that don't involve Azure

[InstantKarmma]

Anyone know of MFA solutions for Windows Server (2008+) that don't involve Azure? We're looking to use MFA (TOTP, probably) for logins to a Windows server. It's a stand-alone server - not part of a domain.

Anyone? Bueller?

 

[AlNipper49]

We use Duo

 

[NortheasternPJ]

As Nip said, Duo's great.

 

[opes]

ping identity, yubikey's. Citrix for VPN. If its a stand along machine off the domain, I would go with a yubikey if its just 1 system.