You can add, configure and enable an Auth Module to let users log in to YouTrack with their credentials stored in the service that provides the Auth Module.
YouTrack provides pre-configured OpenID authentication modules for Yahoo! and AOL. Additional providers that support Open ID can be enabled with the generic authentication module for OpenID.
The authentication modules for Google and GitHub can be configured for OAuth 2.0.
/logs/hub-export.logfile contains a log of events related to user-management upgrades. The system administrator can check this file to detect problems related to users who were not imported or disabled OAuth modules.