How To Fix ICM601 - Number of open network connections has exceeded the threshold

SAP Error Message - Details

• Message type: E = Error

• Message class: ICM - Messages for ICM Monitor

• Message number: 601

• Message text: Number of open network connections has exceeded the threshold

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 ICM601 - Number of open network connections has exceeded the threshold ?

  The SAP error message ICM601 indicates that the number of open network connections to the Internet Communication Manager (ICM) has exceeded a predefined threshold. This can lead to performance issues or service interruptions in your SAP system. Here’s a breakdown of the cause, potential solutions, and related information:
  Cause
  
  High Traffic Volume: A sudden increase in user requests or background jobs can lead to a spike in the number of open connections.
  Configuration Limits: The ICM has a maximum limit for open connections, which is defined in the profile parameters. If this limit is set too low for your usage, it can trigger this error.
  Connection Leaks: Applications or services that do not properly close connections can lead to an accumulation of open connections.
  Long-Running Requests: If requests take a long time to process, they can hold connections open longer than necessary.
  
  Solutions
  
  
  Increase Connection Limits:
  
  You can increase the maximum number of allowed connections by adjusting the profile parameters. The relevant parameters are:
  
  icm/max_conn: This parameter defines the maximum number of connections that the ICM can handle.
  icm/keep_alive_timeout: This parameter defines how long a connection can remain idle before being closed.
  
  
  To change these parameters, you can use transaction RZ10 to edit the instance profile and then restart the ICM.
  
  
  
  Monitor and Optimize Traffic:
  
  Use transaction SMICM to monitor the current connections and analyze the traffic patterns. This can help identify peak usage times and potential bottlenecks.
  Consider load balancing or scaling your SAP application to handle higher traffic volumes.
  
  
  
  Review Application Code:
  
  Check for any application code that may not be closing connections properly. Ensure that all connections are being released after use.
  
  
  
  Adjust Timeout Settings:
  
  Review and adjust timeout settings for connections to ensure that they are not held open longer than necessary.
  
  
  
  Check for Long-Running Processes:
  
  Identify and optimize any long-running processes that may be holding connections open.
  
  
  
  Related Information
  
  Monitoring Tools: Use tools like SAP Solution Manager or transaction ST03N to analyze performance and connection usage.
  SAP Notes: Check for relevant SAP Notes that may provide additional insights or patches related to ICM performance and connection handling.
  Documentation: Refer to the official SAP documentation for ICM configuration and performance tuning for more detailed guidance.
  
  Conclusion
  Addressing the ICM601 error involves a combination of configuration adjustments, monitoring, and potentially optimizing application code. By taking these steps, you can help ensure that your SAP system can handle the required number of connections without exceeding the threshold.