For screenshots and instructions please see: https://itservices.stanford.edu/service/vpn/twostep
Announcement from the Stanford Information Security Office:
Beginning Wednesday 2-25-2015 at 8am, you will be prompted for two-step authentication when logging into the Stanford Virtual Private Network (VPN). We made the decision to add two-step authentication to our VPN system because this service is frequently used by hackers to gain unauthorized access to Stanford resources via compromised SUNet accounts. The addition of two-step authentication will prevent this abuse, just as it strongly protects access to our web-based services.
Instructions are provided in pop-up windows as you log into the VPN. Begin by typing in your username and password as usual. You will then be prompted to enter your two-step code, or you can select among your listed two-step options such as push notification, text messaging or phone callback. If you select to have a code delivered by text message, you will enter the code at the next prompt. For more information and instructions, please see https://itservices.stanford.edu/service/vpn/twostep.
As you will be prompted for two-step authentication each time you connect to the VPN, we understand that this means that you will be using two-step authentication on a more frequent basis. We therefore encourage you to take advantage of our recently enhanced two-step authentication system which provides additional options that make it much more versatile. For more information, please visit http://twostep.stanford.edu/. To explore the new options directly, go to https://accounts.stanford.edu/manage and click on the "Two-Step Auth" tab.