How To Fix /SAPAPO/AMON021 - New session could not be started

SAP Error Message - Details

• Message type: E = Error

• Message class: /SAPAPO/AMON -

• Message number: 021

• Message text: New session could not be started

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SAPAPO/AMON021 - New session could not be started ?

  The SAP error message /SAPAPO/AMON021 New session could not be started typically occurs in the context of SAP Advanced Planning and Optimization (APO) when there is an issue with starting a new session for a specific transaction or process. This error can arise due to various reasons, and here are some common causes, potential solutions, and related information:
  Causes:
  
  Session Limit Exceeded: The user may have reached the maximum number of sessions allowed by the SAP system.
  System Configuration: The system may not be configured correctly to allow new sessions.
  User Lock: The user account may be locked or have restrictions that prevent starting new sessions.
  Resource Limitations: The SAP system may be experiencing resource limitations (e.g., memory, CPU) that prevent new sessions from being initiated.
  Network Issues: Connectivity problems between the client and the SAP server can also lead to this error.
  
  Solutions:
  
  
  Check Session Limit:
  
  Go to the SAP GUI and check how many sessions you currently have open. Close any unnecessary sessions to free up space.
  You can also check the user profile settings to see if the session limit can be increased.
  
  
  
  User Account Status:
  
  Verify that your user account is not locked or restricted. You may need to contact your SAP administrator to check the user status.
  
  
  
  System Configuration:
  
  Ensure that the system parameters related to session management are correctly configured. This may require access to transaction codes like RZ10 or RZ11 to check profile parameters.
  
  
  
  Resource Monitoring:
  
  Check the system's performance and resource usage. Use transaction codes like SM50 or SM66 to monitor active processes and see if there are any bottlenecks.
  
  
  
  Network Connectivity:
  
  Ensure that there are no network issues affecting your connection to the SAP server. You can try reconnecting or using a different network.
  
  
  
  Restart SAP GUI:
  
  Sometimes, simply restarting the SAP GUI can resolve temporary issues.
  
  
  
  Contact Support:
  
  If the issue persists, consider reaching out to your SAP Basis team or SAP support for further assistance. They may need to check logs or system settings that are not accessible to regular users.
  
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that might address this specific error. You can search the SAP Support Portal for notes related to /SAPAPO/AMON021.
  Transaction Codes: Familiarize yourself with transaction codes like SM21 (System Log), ST22 (Dump Analysis), and SMD (SAP Solution Manager Diagnostics) for troubleshooting.
  Documentation: Review the SAP documentation for APO and session management for more detailed information on configuration and limitations.
  
  By following these steps, you should be able to diagnose and resolve the /SAPAPO/AMON021 New session could not be started error.