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

Troubleshooting ORA-12560: TNS: Protocol Adapter Error in Oracle

The ORA-12560 error message in Oracle indicates a problem with the network connection to your database. This prevents you from logging in. The solution involves checking the database service and testing the connection using the TNS ping utility.

Steps to Resolve the Error:

1. Verify Oracle Database Service Status:

   • Access the Windows Services window (Start -> Run -> Services.msc).
   • Locate the Oracle service (e.g., "OracleServiceORCL"). If it's stopped, click "Start" to begin the service.

2. Use TNS Ping to Test Connectivity:

   • Open a command prompt or terminal.

   • Execute the following command, replacing <tnsalias> with the correct TNS alias from your tnsnames.ora file:

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

A successful TNS ping confirms the protocol adapter is working and the database is reachable. Failure indicates further investigation is required, such as checking network connectivity and firewall rules.

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