How To Fix MQ166 - Package & is already "not able to be restarted"

SAP Error Message - Details

• Message type: E = Error

• Message class: MQ - Messages for Euro Changeover Package

• Message number: 166

• Message text: Package & is already "not able to be restarted"

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.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

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.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message MQ166 - Package & is already "not able to be restarted" ?

  The SAP error message MQ166 typically indicates that a message queue (MQ) package is in a state where it cannot be restarted. This can occur in various scenarios, often related to issues with message processing or system configuration. Here’s a breakdown of the potential causes, solutions, and related information for this error:
  Causes:
  
  Message Processing Failure: The package may have encountered an error during processing, leading to its current state.
  System Configuration Issues: Misconfigurations in the message queue settings or related components can prevent the package from being restarted.
  Resource Limitations: Insufficient system resources (like memory or processing power) can lead to failures in processing messages.
  Network Issues: Problems with network connectivity can disrupt communication between components, causing the package to fail.
  Database Locking: If the database is locked or there are issues with database connectivity, it can prevent the package from being processed or restarted.
  
  Solutions:
  
  Check Logs: Review the application and system logs for any specific error messages or warnings that can provide more context about the failure.
  Restart the Queue: If possible, try to restart the message queue or the entire application to clear any transient issues.
  Configuration Review: Verify the configuration settings for the message queue and ensure they are correct. This includes checking connection parameters, resource allocations, and any relevant settings.
  Resource Monitoring: Monitor system resources to ensure that there are no bottlenecks. If resources are low, consider scaling up the system or optimizing resource usage.
  Database Check: Ensure that the database is functioning correctly and that there are no locks or connectivity issues. You may need to consult your database administrator for assistance.
  Error Handling: Implement or review error handling mechanisms in your application to gracefully handle failures and allow for retries or alternative processing paths.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or patches related to the MQ166 error. SAP frequently updates its knowledge base with solutions for common problems.
  Documentation: Review the official SAP documentation for message queues and related components to ensure that you are following best practices.
  Support: If the issue persists, consider reaching out to SAP support for assistance. Provide them with detailed logs and information about the environment to facilitate troubleshooting.
  
  Conclusion:
  The MQ166 error indicates a failure in the message queue processing that prevents the package from being restarted. By investigating the causes and applying the suggested solutions, you can often resolve the issue. If necessary, don't hesitate to seek help from SAP support or your internal IT team.