I am signed in to a website on two different machines. I sign out on one of the machines. Strangely, I am ‘automagically’ signed out on the other machine. What’s wrong?
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There are many ways of handling authentication in any web application , Some web applications like this stores some thing called login Id in the database which will be reused on subsequent login , and when the user logs out , login id in the database gets deleted , and his session will be cleared .
After the user logs out when you refresh the page in other machine it will check whether the person has valid login ID in database or not , if he don’t have then it will call logout process . This is implemented to provide secured browsing to user .
There are some web applications which will allow user to logout all other existing sessions for eg GMail . when you login you can see a link to view existing sessions and allows you tto logout all existing sessions .