How To Fix GW021 - No work processes exist

SAP Error Message - Details

• Message type: E = Error

• Message class: GW - Message Texts for Gateway

• Message number: 021

• Message text: No work processes exist

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

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Smart SAP Assistant

• What is the cause and solution for SAP error message GW021 - No work processes exist ?

  The SAP error message GW021 ("No work processes exist") typically indicates that the SAP Gateway is unable to find any available work processes to handle the incoming requests. This can occur for several reasons, and understanding the cause is crucial for resolving the issue.
  Causes of GW021 Error
  
  
  All Work Processes are Busy: If all the work processes are currently occupied with other tasks, new requests cannot be processed.
  
  
  Work Process Configuration: The configuration of the SAP system may not have enough work processes defined to handle the load.
  
  
  System Overload: High system load due to excessive requests or long-running processes can lead to all work processes being utilized.
  
  
  System Errors: There may be underlying issues with the SAP system, such as database connectivity problems or other system errors that prevent work processes from being available.
  
  
  Resource Limitations: Insufficient system resources (CPU, memory) can lead to work processes being unable to start.
  
  
  Network Issues: Problems with network connectivity can also lead to the inability to communicate with the work processes.
  
  
  Solutions to GW021 Error
  
  
  Check Work Process Status:
  
  Use transaction code SM50 to check the status of work processes. Look for any processes that are in a "waiting" state or are stuck.
  
  
  
  Increase Work Processes:
  
  If the system is consistently running out of work processes, consider increasing the number of work processes in the instance profile. This can be done in transaction RZ10 by modifying the instance profile parameters (e.g., rdisp/wp_no_dia, rdisp/wp_no_btc, etc.).
  
  
  
  Monitor System Load:
  
  Use transaction ST03N to analyze the workload and identify any long-running transactions or processes that may be consuming resources.
  
  
  
  Restart Work Processes:
  
  If you find that work processes are stuck, you may need to restart them. This can be done by restarting the SAP instance.
  
  
  
  Check System Resources:
  
  Ensure that the server has adequate CPU and memory resources. Monitor system performance using tools like OS monitoring or SAP Solution Manager.
  
  
  
  Review Logs:
  
  Check the system logs (transaction SM21) and developer traces (transaction ST22) for any errors that might indicate underlying issues affecting work processes.
  
  
  
  Network Configuration:
  
  Ensure that there are no network issues affecting communication between the SAP application server and the database or other components.
  
  
  
  Consult SAP Notes:
  
  Search for relevant SAP Notes in the SAP Support Portal that may address specific issues related to the GW021 error.
  
  
  
  Related Information
  
  
  Transaction Codes:
  
  SM50: Monitor work processes.
  SM66: Global work process overview.
  ST03N: Workload analysis.
  RZ10: Profile parameter maintenance.
  SM21: System log.
  ST22: Dump analysis.
  
  
  
  SAP Documentation: Refer to the official SAP documentation for detailed information on work process management and performance tuning.
  
  
  SAP Community: Engage with the SAP Community for insights and solutions shared by other users who may have encountered similar issues.
  
  
  By following these steps, you should be able to diagnose and resolve the GW021 error effectively.