This tag refers to a situation in which you cannot access a protected system, file, database, etc.

- Stackoverflow.com Wiki
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You see, the world of forgotten passwords is actually a little murky. There are plenty of different perfectly legitimate angles and a bunch of pretty bad ones as well. Chances are you’ve experienced each many times as an end user so let me try and draw on some of these examples to see who’s doing it well, who’s not and what you need to focus on to get it right in your app.