How To Fix 00466 - Max. number of connections reached. Retry later

SAP Error Message - Details

• Message type: E = Error

• Message class: 00 -

• Message number: 466

• Message text: Max. number of connections reached. Retry later

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 00466 - Max. number of connections reached. Retry later ?

  The SAP error message "00466 Max. number of connections reached. Retry later" indicates that the maximum number of concurrent connections to the SAP system has been reached. This can happen in environments where there are many users or processes trying to access the system simultaneously, exceeding the configured limit for connections.
  Causes:
  
  High User Load: A large number of users trying to log in at the same time can exceed the connection limit.
  Long-Running Sessions: Users or processes that do not log off properly can hold onto connections longer than necessary.
  Configuration Limits: The SAP system may be configured with a low maximum number of connections.
  Background Jobs: Background jobs or processes that are not releasing connections can contribute to reaching the limit.
  Network Issues: Network problems can cause connections to hang, leading to a perceived increase in active connections.
  
  Solutions:
  
  
  Increase Maximum Connections:
  
  The SAP system administrator can increase the maximum number of connections allowed in the system profile parameters. This is done by adjusting the rdisp/mshm_max_con parameter in the instance profile.
  After making changes, the SAP instance needs to be restarted for the changes to take effect.
  
  
  
  Monitor and Manage Sessions:
  
  Use transaction codes like SM04 (User Overview) and SM50 (Process Overview) to monitor active sessions and identify long-running or idle sessions.
  Administrators can terminate sessions that are no longer needed.
  
  
  
  Optimize Background Jobs:
  
  Review and optimize background jobs to ensure they are not holding onto connections longer than necessary.
  
  
  
  User Education:
  
  Educate users about logging off properly after their sessions to free up connections.
  
  
  
  Check for Network Issues:
  
  Investigate any network issues that may be causing connections to hang or not close properly.
  
  
  
  Load Balancing:
  
  If applicable, consider implementing load balancing to distribute user connections across multiple application servers.
  
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to connection limits and performance tuning for specific guidance and best practices.
  System Monitoring: Regularly monitor system performance and connection usage to proactively manage connection limits.
  Documentation: Refer to SAP documentation for detailed information on system parameters and configuration settings.
  
  By addressing the underlying causes and implementing the suggested solutions, you can mitigate the occurrence of this error and improve the overall performance and availability of the SAP system.