Name	Ban user
Actor	Admin
Service	Settings Service
Description	This use case describes the procedure of banning a user/removing their access to the system.
Pre-condition	Actor is logged in: login
Scenario	Actor views user and decides to block a user. System blocks the user. System applies the login ban and informs the actor about the result.
Result	The user to ban can not login into the system anymore and all current logins will be terminated.
Exceptions	1. System message: "unknown user" 1.1 Use case ends here