401 Error - Timestamp Expired

401 Error - Timestamp Expired401_Error_-_Timestamp_Expired.png

Error Code Cause

Users will see this error when they click a link to view a VitalSource eBook inside their LMS, but the LMS' server time does not match the VitalSource server time. Please note, the tolerance time is 5 minutes. This causes the server to reject the request, thinking it is an old or cached request.


Request that the LMS administrator corrects the time on the LMS server. It does not matter which time zone the server is in, as long as the time, date, and time zone settings are correct.