How to Troubleshoot ORA-12560: TNS: Protocol Adapter Error?

ORA-12560: TNS: Protocol Adapter Error - A Troubleshooting Guide

The ORA-12560 error signifies a communication failure between your application and the Oracle database. This guide focuses on a specific scenario to help you resolve this issue.

Resolution Steps:

1. Confirm Oracle Service Operation:

   • Access your Oracle database server's services (Start > Run > Services.msc).
   • Locate the "OracleService " service (e.g., OracleServiceORCL) and ensure it's running. Start it if necessary.

2. Test Database Connection:

   • Open a server command prompt.
   • Execute the following command, replacing <tnsalias> with the appropriate entry from your tnsnames.ora file:

   <code class="language-bash">tnsping <tnsalias></code>

3. Network Configuration Verification:

   • Confirm network communication between the database server and client.
   • Review firewall rules and network connectivity.
   • Verify the Oracle listener is using the correct port.

4. Socket Inspection:

   • Examine your tnsnames.ora file for any incorrect or missing socket details.
   • Ensure the database server is listening on the specified IP address and port.

5. Restart Client and Server:

   • If the previous steps fail, restart both the client application and the database server.

6. Review Database Logs:

   • Check the Oracle database logs (e.g., alert_SID.log) for further error messages providing clues to the problem's root cause.

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