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I want to prevent the user’s concurrent login based on the admin settings.
If admin set the concurrent login settings as 3, then the user can login from 3 different places at a time.
If the user attempts to login from 4th place, the application should not allow the user to login.
Any idea how to maintain this via database. Please help. Thanks in advance.
You could maintain a DB-table with active user sessions, where a session is considered active, if last user activity took place less then X minutes ago (configurable value).
Each time a user tries to authenticate throgh the login form, you should check how many sessions for that user are active at the moment, and based upon that check make a decision whether to authenticate him or decline with some form of response message.