Reasons for session failure

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Reasons for session failure include session timeout, session number limit, session integrity check, server restart, browser or device problems, etc. Detailed introduction: 1. Session timeout: The server sets a default timeout for the Session. When the user does not interact with the server for a period of time, the Session will automatically expire; 2. Session number limit: The server has a number of Sessions for each user. A limit is set. When the number of Sessions created by a user exceeds this limit, the latest one will overwrite the oldest one and so on.