What should I do if the oracle database listening service cannot connect to the identifier?

Oracle database listening service cannot connect to the identification. Possible reasons and solutions: check identification permissions and existence; confirm that the password is correct and reset the password; check the listener configuration and "connect through" permissions; remove firewall restrictions ; Start the database server; troubleshoot network connectivity; check TNS alias configuration; check the error log and Oracle documentation for other errors.

Solve the problem that the Oracle database listening service cannot connect to the identifier

: Oracle database listening service What should I do if I cannot connect to the logo?

Answer:

The failure to connect to the identity may be due to one of the following reasons:

1. The identity is not authorized

• Check whether the identity has the required permissions to connect to the database.
• Check whether the identifier exists in the database.

2. Incorrect password

• Make sure the password you entered is correct.
• Reset the identity's password and try to connect again.

3. Listener configuration error

• Check whether the identifier is correctly configured in the listener configuration file.
• Check whether the identity has been granted the "connect through" permission.

4. Database firewall restrictions

• Check whether the database firewall is blocking the connection.
• Configure the firewall to allow identity connections.

5. Database server is shut down

• Check whether the database server is running.
• Start the database server and try to reconnect.

6. Network problems

• Check whether the network connection from the client to the database server is normal.
• Try to connect using different network ports.

7. TNS configuration error

• Check whether the TNS alias is configured correctly.
• Check that the server name and port specified in the TNS alias are correct.

8. Other Errors

• Check the Oracle error log for more details.
• Check the Oracle documentation to find solutions for specific error codes.

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