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Error: "Your login session has expired"

Yahoo displays this message and asks that you sign in again as a safeguard for Yahoo Mail users, especially those who use public or shared computers.

You'll see this message if it's been more than eight hours since you last signed in to Yahoo Mail and still haven't signed out.

Good to know: if the time isn't set correctly on your computer, browsers will have difficulty managing cookie files and generate error messages more frequently.