How To Fix RT366 - &1: Instance active

SAP Error Message - Details

• Message type: E = Error

• Message class: RT - Monitoring infrastructure MSG and alert texts

• Message number: 366

• Message text: &1: Instance active

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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Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

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Smart SAP Assistant

• What is the cause and solution for SAP error message RT366 - &1: Instance active ?

  The SAP error message RT366 typically indicates that an instance is already active when you are trying to start or perform an operation on it. This can occur in various contexts, such as when dealing with application servers, database instances, or other components within the SAP landscape.
  Cause:
  The error message RT366 usually arises due to one of the following reasons:
  
  Instance Already Running: The instance you are trying to start is already running or has not been properly shut down.
  Configuration Issues: There may be configuration issues in the instance profile or the system settings that prevent the instance from being started or stopped correctly.
  Lock Files: Sometimes, lock files may prevent the instance from being started or stopped, leading to this error.
  Resource Conflicts: There may be resource conflicts or issues with the underlying operating system or hardware that prevent the instance from being managed correctly.
  
  Solution:
  To resolve the RT366 error, you can follow these steps:
  
  
  Check Instance Status:
  
  Use transaction codes like SM51 (for application servers) or DB02 (for database instances) to check the status of the instance. Ensure that the instance is not already running.
  
  
  
  Stop the Instance:
  
  If the instance is running and you need to restart it, you can try to stop it first. Use the appropriate command or transaction to stop the instance gracefully.
  
  
  
  Check for Lock Files:
  
  Navigate to the instance directory on the server and check for any lock files (e.g., *.lock). If you find any, ensure that they are not preventing the instance from starting or stopping. You may need to delete these files if you are sure that the instance is not running.
  
  
  
  Review Logs:
  
  Check the instance logs (e.g., dev_w0, dev_rfc) for any additional error messages or warnings that might provide more context about the issue.
  
  
  
  Configuration Review:
  
  Review the instance profile and configuration settings to ensure that they are correct and do not contain any errors.
  
  
  
  Restart the Host:
  
  If the issue persists, consider restarting the host machine where the instance is running. This can help clear any lingering processes or locks.
  
  
  
  Consult SAP Notes:
  
  Check the SAP Support Portal for any relevant SAP Notes that might address this specific error message or provide additional troubleshooting steps.
  
  
  
  Contact SAP Support:
  
  If you are unable to resolve the issue, consider reaching out to SAP Support for further assistance.
  
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SM51, SM66, DB02, and SMLG for monitoring and managing instances.
  SAP Documentation: Refer to the official SAP documentation for detailed information on instance management and troubleshooting.
  System Administration: Ensure that you have the necessary authorizations and access rights to perform operations on the SAP instances.
  
  By following these steps, you should be able to diagnose and resolve the RT366 error effectively.