How To Fix /IWBEP/CM_MGW_RT189 - An exception occurred when accessing cached data in shared memory

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWBEP/CM_MGW_RT -

• Message number: 189

• Message text: An exception occurred when accessing cached data in shared memory

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 /IWBEP/CM_MGW_RT189 - An exception occurred when accessing cached data in shared memory ?

  The SAP error message /IWBEP/CM_MGW_RT189 indicates that there was an exception when accessing cached data in shared memory, typically related to the SAP Gateway framework. This error can occur in various scenarios, often when there are issues with the configuration or the state of the shared memory.
  Causes:
  
  Memory Corruption: The shared memory segment may be corrupted or not properly initialized.
  Configuration Issues: Incorrect configuration of the SAP Gateway or related components can lead to this error.
  Version Mismatch: Incompatibility between different components or versions of the SAP system.
  Resource Limitations: Insufficient memory resources allocated to the SAP instance.
  Transport Issues: Problems with the transport layer that affect the retrieval of cached data.
  
  Solutions:
  
  Restart the SAP Gateway: Sometimes, simply restarting the SAP Gateway can resolve temporary issues with shared memory.
  Check Configuration: Review the configuration settings for the SAP Gateway and ensure they are correct. Pay attention to settings related to caching and memory allocation.
  Clear Cache: Clear the cache for the SAP Gateway. This can often resolve issues related to stale or corrupted cached data.
  
  You can do this using transaction code /IWFND/CACHE_CLEANUP.
  
  
  Monitor Memory Usage: Use transaction codes like SM04 or SM50 to monitor memory usage and ensure that there are sufficient resources available.
  Check for Updates: Ensure that your SAP system is up to date with the latest patches and updates, as these may contain fixes for known issues.
  Review Logs: Check the system logs (transaction SLG1) for any additional error messages or warnings that may provide more context about the issue.
  Consult SAP Notes: Look for relevant SAP Notes in the SAP Support Portal that may address this specific error or provide additional troubleshooting steps.
  
  Related Information:
  
  SAP Gateway: The SAP Gateway is a technology that enables the connection of devices, environments, and applications to SAP systems. It is crucial for OData services and other integrations.
  Shared Memory: Shared memory is used in SAP systems to improve performance by caching frequently accessed data. Issues with shared memory can lead to performance degradation and errors.
  SAP Support: If the issue persists after trying the above solutions, consider reaching out to SAP Support for further assistance. They can provide more in-depth analysis and troubleshooting based on your specific system configuration.
  
  By following these steps, you should be able to diagnose and resolve the error message /IWBEP/CM_MGW_RT189.