How To Fix PWWW126 - Error when writing log

SAP Error Message - Details

• Message type: E = Error

• Message class: PWWW - HR: Internet Scenarios

• Message number: 126

• Message text: Error when writing log

What causes this issue?

An error occurred when the system was writing the log. Nevertheless,
the chosen activity was performed.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message PWWW126 - Error when writing log ?

  The SAP error message PWWW126, which indicates "Error when writing log," typically occurs in the context of the SAP Web Application Server or when dealing with the SAP Web Dispatcher. This error can arise due to various reasons, including issues with file permissions, disk space, or configuration settings.
  Causes:
  
  File Permissions: The user under which the SAP system is running may not have the necessary permissions to write to the log file directory.
  Disk Space: The disk where the log files are stored may be full, preventing new log entries from being written.
  Configuration Issues: There may be misconfigurations in the logging settings or paths defined in the SAP system.
  File System Issues: Problems with the underlying file system, such as corruption or read-only status, can also lead to this error.
  Network Issues: If the logs are being written to a remote location, network issues could prevent writing.
  
  Solutions:
  
  
  Check File Permissions:
  
  Ensure that the user running the SAP instance has write permissions to the log directory. You can check and modify permissions using operating system commands (e.g., chmod on Unix/Linux).
  
  
  
  Check Disk Space:
  
  Verify that there is sufficient disk space available on the server. You can use commands like df -h on Unix/Linux to check disk usage.
  
  
  
  Review Configuration Settings:
  
  Check the configuration settings for logging in the SAP system. Ensure that the paths for log files are correctly set and accessible.
  
  
  
  Check File System Health:
  
  If you suspect file system issues, run file system checks (e.g., fsck on Unix/Linux) to identify and fix any problems.
  
  
  
  Restart the SAP Instance:
  
  Sometimes, simply restarting the SAP instance can resolve temporary issues related to logging.
  
  
  
  Check SAP Notes:
  
  Look for relevant SAP Notes in the SAP Support Portal that may address this specific error or provide patches and updates.
  
  
  
  Consult Logs:
  
  Review other logs (e.g., developer traces, system logs) for additional context or related errors that may help diagnose the issue.
  
  
  
  Related Information:
  
  SAP Documentation: Refer to the official SAP documentation for detailed information on logging and error handling.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they found effective.
  SAP Support: If the issue persists, consider reaching out to SAP Support for assistance, especially if it impacts production systems.
  
  By following these steps, you should be able to identify and resolve the underlying cause of the PWWW126 error in your SAP environment.