has someone a solution for a simple and affordable two factor authentication for RDP similar to the SSH login on a unix machine?


2 Answers 2


PhoneFactor might do the trick:


  • Free too for < 25 users I believe.
    – gravyface
    Oct 14, 2011 at 16:05
  • It is. I've used it to provide two factor authentication for web services.
    – joeqwerty
    Oct 14, 2011 at 16:07

If you use Radius for authentication, all the major two-factor authentication systems are options for you. You probably need to run the RDP through ISA.

Here's a tutorial I wrote some time ago: http://www.wikidsystems.com/support/wikid-support-center/how-to/how-to-configure-the-microsoft-isa-server-to-support-two-factor-authentication-from-wikid. Note that IAS has been replaced by NPS in 2008+.

  • we don't use radius, because we are looking for a "simple and affordable" solution ;)
    – perler
    Jan 20, 2012 at 20:19
  • hmm, I find radius to be pretty simple. And free since the MS radius plugin is free and on linux, freeradius.
    – nowen
    Apr 18, 2012 at 16:20

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