- Server malfunction: It is possible that the database server is experiencing issues, resulting in a connection failure.
- Network issue: Unstable network connection or network failure may result in inability to connect to the database.
- Configuration error: Database connection information is configured incorrectly, such as incorrect usernames, passwords, or host addresses.
- Firewall configuration: The firewall may be blocking the database connection, so it is necessary to check the firewall settings.
- The database service is not running: The database service is either not started or has unexpectedly stopped, causing a connection failure.
- Connection limit: The database connection limit may have been reached, preventing further connections from being established.
- Database crash: The database may have crashed or become corrupted, leading to an inability to connect.
- High load: The database is overloaded and unable to handle new connection requests.
- Safety restriction: Database security policies restrict connections from certain clients, requiring a check of the security settings.
- Other reasons: unknown factors are causing the database to be unable to connect. A detailed investigation is needed to determine the specific cause.
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