How to Fix ORA-12560: TNS:protocol adaptor error Login Problems?

Troubleshooting the "ORA-12560: TNS:protocol adaptor error" Oracle Database Connection Problem

Encountering the "ORA-12560: TNS:protocol adaptor error" message while connecting to an Oracle database? This guide provides a solution.

Resolution:

Follow these steps to address the connection issue:

1. Check Oracle Database Server Status:

   • Access the Services console on the Oracle database server (Start -> Run -> Services.msc).
   • Verify that the Oracle service (e.g., OracleServiceORCL) is running. If not, start it.

2. Test TNS Connection:

   • Open a command prompt or terminal.

   • Execute the tnsping command, replacing <tnsalias> with the appropriate alias from your tnsnames.ora file:

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

   • A successful connection will display an "OK" message. Investigate further if it fails.

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