How To Fix NET021 - Name resolution of log names and log numbers

SAP Error Message - Details

• Message type: E = Error

• Message class: NET - Network Messages

• Message number: 021

• Message text: Name resolution of log names and log numbers

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 NET021 - Name resolution of log names and log numbers ?

  The SAP error message NET021 typically indicates an issue with the name resolution of log names and log numbers in the context of network communication or logging within the SAP system. This error can arise due to various reasons, including configuration issues, network problems, or incorrect settings in the SAP system.
  Causes:
  
  Incorrect Configuration: The SAP system may have incorrect settings in the instance profile or network configuration that prevent proper name resolution.
  DNS Issues: If the SAP system relies on DNS for name resolution, any issues with the DNS server or incorrect DNS entries can lead to this error.
  Network Connectivity: Problems with network connectivity between the SAP application server and the database or other components can cause this error.
  Log File Issues: If the log files are not accessible or if there are permission issues, the system may not be able to resolve the log names or numbers.
  SAP Kernel Issues: Sometimes, bugs or issues in the SAP kernel can lead to this error.
  
  Solutions:
  
  Check Configuration: Review the instance profile and network configuration settings in the SAP system. Ensure that all parameters related to logging and network communication are correctly set.
  DNS Configuration: Verify the DNS settings on the server. Ensure that the hostname can be resolved correctly. You can use commands like nslookup or ping to test name resolution.
  Network Connectivity: Check the network connectivity between the SAP application server and the database or other components. Ensure that there are no firewalls or network policies blocking communication.
  Log File Permissions: Ensure that the SAP system has the necessary permissions to access the log files. Check the file system permissions and ownership of the log directories.
  SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that may address this specific error. There may be patches or updates available that resolve known issues.
  Kernel Update: If the issue persists, consider updating the SAP kernel to the latest version, as this may resolve underlying bugs.
  
  Related Information:
  
  SAP Documentation: Refer to the official SAP documentation for detailed information on network configuration and logging.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they have found.
  SAP Support: If the problem cannot be resolved through the above steps, consider reaching out to SAP Support for assistance.
  
  By following these steps, you should be able to diagnose and resolve the NET021 error in your SAP system.