This web part allows users to log into the website using their OpenID accounts. Please note that OpenID authentication does not work when running in a Medium Trust environment.
In order for this web part to work, OpenID authentication must be enabled and configured properly for the website. This can be done by global administrators in Site Manager -> Settings -> Security & Membership -> Authentication -> OpenID.
Help URL: http://devnet.kentico.com/docs/webparts/index.html?OpenIDlogon_overview.htm