Error
Error Code: ACFS-05086

Oracle Database Error ACFS-05086: Standby Listener Offline

📦 Oracle Database
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Description

This error indicates that the Oracle Net Listener process, which is essential for client connections and redo log transport, is not active on the standby database server. It typically occurs in Oracle Data Guard or other high-availability configurations, preventing connectivity and proper database synchronization.
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Error Message

listener is not running on the standby site
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Known Causes

4 known causes
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Listener Process Inactive
The Oracle Net Listener process was manually stopped, failed unexpectedly, or did not start automatically on the standby server.
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Incorrect Listener Configuration
The 'listener.ora' file on the standby site contains incorrect parameters, or the configuration is missing, preventing the listener from starting or functioning correctly.
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Standby Host Network Problems
Network connectivity issues or the standby server itself is down or inaccessible, preventing the listener from starting or being reached.
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Port Conflict
Another service is already using the configured listener port on the standby server, preventing the Oracle Listener from binding to it.
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Solutions

Coming Soon

Detailed step-by-step solutions for this error are being prepared. In the meantime, try these general troubleshooting tips:

General Troubleshooting Tips

  • Check the error message carefully for specific details
  • Review recent changes that might have caused the error
  • Search for the exact error code in the official documentation
  • Check log files for additional context
  • Try restarting the application or service

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