How To Fix ICM522 - Maximum Number of HTTP Server Cache Entries

SAP Error Message - Details

• Message type: E = Error

• Message class: ICM - Messages for ICM Monitor

• Message number: 522

• Message text: Maximum Number of HTTP Server Cache Entries

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 ICM522 - Maximum Number of HTTP Server Cache Entries ?

  The SAP error message ICM522: Maximum Number of HTTP Server Cache Entries indicates that the Internet Communication Manager (ICM) has reached the maximum limit of cache entries for HTTP server responses. This can lead to performance issues, as the cache is used to store frequently accessed data to speed up response times.
  Cause:
  The error typically occurs due to one or more of the following reasons:
  
  High Traffic Volume: A large number of requests may lead to the cache being filled quickly.
  Configuration Limits: The default configuration for the maximum number of cache entries may be too low for your specific use case.
  Inefficient Cache Management: If the cache is not being managed properly, it may fill up with stale or unnecessary entries.
  
  Solution:
  To resolve the ICM522 error, you can take the following steps:
  
  
  Increase Cache Size:
  
  You can increase the maximum number of cache entries by modifying the ICM parameters in the SAP system profile. The parameter to adjust is:
  
  icm/HTTP/max_cache_entries
  
  
  Set this parameter to a higher value based on your system's requirements. For example, you might set it to 10000 or more, depending on your traffic and usage patterns.
  
  
  
  Clear Cache:
  
  You can manually clear the cache to free up space. This can be done using transaction code SMICM:
  
  Go to the Cache tab and select Clear Cache.
  
  
  Alternatively, you can restart the ICM, which will also clear the cache.
  
  
  
  Monitor Cache Usage:
  
  Regularly monitor the cache usage to understand how quickly it fills up and adjust the parameters accordingly.
  Use transaction SMICM to check cache statistics and performance.
  
  
  
  Optimize Cache Entries:
  
  Review the types of entries being cached and consider optimizing the caching strategy. For example, ensure that only necessary responses are cached and that cache expiration policies are in place.
  
  
  
  Review Application Logic:
  
  If certain requests are causing excessive cache usage, review the application logic to see if there are ways to reduce the number of unique responses being cached.
  
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may provide additional guidance or updates related to this error.
  Documentation: Refer to the official SAP documentation for ICM configuration and performance tuning.
  Performance Monitoring: Use tools like SAP Solution Manager to monitor system performance and identify bottlenecks related to HTTP caching.
  
  By following these steps, you should be able to resolve the ICM522 error and improve the performance of your SAP system's HTTP server.