How can you “footprint” a specific computer behind a firewall using HttpContext?

ぐ巨炮叔叔 提交于 2019-12-06 03:56:45

Generate a guid when they login and store it in a cookie and against the user record in the database.

Compare this on each request if it doesnt match you have a concurrent login.

To be clear this cookie is a session cookie like forms authentication if they delete it they will get logged out anyway.

This is a self-answer. I ran across Browser Spy, and while it doesn't address the specifics of how to do this, it does indicate that it is possible through a combination of these items to uniquely identify a specific system with a minimal margin of error.

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