How To Fix ICM020 - Host Name Buffer Could Not Be Read

SAP Error Message - Details

• Message type: E = Error

• Message class: ICM - Messages for ICM Monitor

• Message number: 020

• Message text: Host Name Buffer Could Not Be Read

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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Smart SAP Assistant

• What is the cause and solution for SAP error message ICM020 - Host Name Buffer Could Not Be Read ?

  The SAP error message "ICM020 Host Name Buffer Could Not Be Read" typically occurs in the Internet Communication Manager (ICM) component of SAP when there is an issue with the hostname resolution or the configuration of the ICM. This error can prevent the system from properly handling HTTP requests.
  Causes:
  
  DNS Resolution Issues: The hostname specified in the configuration may not be resolvable due to DNS issues.
  Incorrect Hostname Configuration: The hostname might be incorrectly configured in the SAP system or in the network settings.
  Network Connectivity Problems: There may be network issues preventing the SAP system from reaching the DNS server or the specified hostname.
  Buffer Overflow: The buffer that holds the hostname information may be corrupted or overflowed.
  ICM Configuration Errors: Misconfigurations in the ICM settings can lead to this error.
  
  Solutions:
  
  
  Check Hostname Configuration:
  
  Verify the hostname configured in the SAP system. You can check this in transaction RZ10 or RZ11 for profile parameters related to ICM.
  Ensure that the hostname is correctly specified and matches the actual server name.
  
  
  
  DNS Configuration:
  
  Ensure that the DNS server is reachable and functioning correctly.
  Test the hostname resolution using command-line tools like nslookup or ping to see if the hostname resolves correctly.
  
  
  
  Network Connectivity:
  
  Check the network settings to ensure that there are no firewalls or network policies blocking access to the DNS server or the hostname.
  Verify that the SAP server can communicate with other network resources.
  
  
  
  Review ICM Settings:
  
  Check the ICM settings in transaction RZ10 or RZ11 for any misconfigurations.
  Look for parameters like icm/host_name and ensure they are set correctly.
  
  
  
  Restart ICM:
  
  Sometimes, simply restarting the ICM can resolve transient issues. You can do this through transaction SMICM.
  
  
  
  Check SAP Notes:
  
  Look for any relevant SAP Notes that might address this specific error. SAP frequently updates its knowledge base with solutions for known issues.
  
  
  
  System Logs:
  
  Check the system logs (transaction SM21) and the ICM logs (transaction SMICM) for any additional error messages or warnings that could provide more context about the issue.
  
  
  
  Related Information:
  
  SAP Documentation: Refer to the official SAP documentation for ICM for detailed configuration guidelines.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they found effective.
  SAP Support: If the issue persists, consider reaching out to SAP Support for assistance, especially if you have a support contract.
  
  By following these steps, you should be able to diagnose and resolve the "ICM020 Host Name Buffer Could Not Be Read" error in your SAP system.