Resolved: Known Error impacting 2nd Factor Authentication
Penn State IT staff and the Office of Information Security (OIS) have implemented a fix for 2nd Factor Authentication (DUO) around 1 p.m. today. If you are still experiencing issues, please make sure to clear all cache and browsing history for each browser you use. Use can follow these instructions: https://www.wikihow.com/Clear-Your-Browser%27s-Cache. You can also try a hard refresh by pressing SHIFT and R simultaneously.
For more information, please contact IT Service Desk (itservicedesk@psu.edu).
More information: Resolved: Known Error impacting 2nd Factor Authentication
Story added 4. January 2018, content source with full text you can find at link above.