ORA-12560 Error Resolution: TNS Protocol Adapter Troubleshooting Guide
Posted on 2025-04-18
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Resolving the ORA-12560: TNS:protocol adapter error in Oracle
The "ORA-12560: TNS:protocol adapter error" is a frequent problem when connecting to an Oracle database. This error usually indicates a problem with the database service or the client's inability to connect to the server.
Resolution Steps
Here's how to troubleshoot and fix this error:
-
Ensure the Oracle Database Service is Running:
- Access the Windows Services console (Start > Run > Services.msc).
- Locate the "OracleService
" service (e.g., OracleServiceORCL). If it's not running, right-click and select "Start".
-
Check Network Connectivity:
-
Open a command prompt on your client machine.
-
Use the
tnspingcommand to test connectivity:tnspingReplace
tnsnames.orafile. A successfultnspingconfirms network connectivity; failure suggests issues with firewalls or listener configuration.
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