Sitecore Boosting feature, which allows you to temporarily increase the number of simultaneously active Sitecore Client users, was unavailable from 10-Jan-17 to 13-Jan-17.
Note: The Boosting feature is designed for contingency purposes and should be used only in emergencies. If you need to use it frequently, please contact your Sitecore sales representative.
The service has now been stabilized and works as expected. In case of any issues, please contact Sitecore Support.