What should I do if navicat cannot connect to localhost?

The solutions for Navicat unable to connect to localhost are: 1. Make sure the Navicat service is started; 2. Allow firewall access; 3. Check whether the database service is started; 4. Confirm that the port is correct; 5. Verify the database credentials ;6. Update Navicat version; 7. Try other measures, such as restarting the computer or reinstalling Navicat.

Navicat cannot connect to localhost solution

Navicat is a database management software. When it cannot connect to localhost ( localhost), there may be the following reasons:

1. Navicat service is not running

• Open the task manager and find " Navicat Network Service" and make sure it is in the "Started" state.
• If it is not running, right-click the service and select Start.

2. Firewall blocks connection

• Open the firewall settings and allow Navicat to access the network.
• In "Advanced Settings", find "Inbound Rules" and add a new rule.
• Select "Program" and browse to the Navicat installation directory (for example: C:\Program Files\Navicat\). Select the "NavicatNetworkService.exe" file.
• Allow this program to connect through the firewall.

3. The database service is not running

• For the MySQL database, please ensure that the MySQL service is started.
• For Oracle database, please ensure that the Oracle Database XE service is started.
• Open the service manager, find the corresponding services in the "Services" tab and make sure they are in the "Started" state.

4. Database listening port error

• In Navicat, check the connection properties to make sure you are connected to the correct port.
• By default, the MySQL listening port is 3306 and the Oracle listening port is 1521.
• If the port is wrong, please modify it and try to connect again.

5. Database credentials error

• Check the username and password carefully to make sure they are correct.
• If you forgot your password, please reset it or contact your database administrator.

6. Navicat version is out of date

• Make sure you are using the latest version of Navicat.
• Older versions may be incompatible with new database versions or security updates.

7. Other Causes

• Try the following additional measures:

  • Restart the computer.
  • Reinstall Navicat.
  • Create exceptions for database services.
  • Check whether the network connection is stable.

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