How To Fix NET022 - Order of services for name resolution

SAP Error Message - Details

• Message type: E = Error

• Message class: NET - Network Messages

• Message number: 022

• Message text: Order of services for name resolution

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 NET022 - Order of services for name resolution ?

  The SAP error message NET022, which indicates "Order of services for name resolution," typically arises in the context of network configuration and name resolution issues within an SAP system. This error can occur when the system is unable to resolve hostnames to IP addresses due to misconfiguration in the order of name resolution services.
  Cause:
  The error can be caused by several factors, including:
  
  Incorrect Hostname Resolution Configuration: The order of name resolution services (like DNS, /etc/hosts, etc.) may not be set correctly.
  Network Configuration Issues: Problems with the network settings, such as incorrect DNS server addresses or issues with the local hosts file.
  Firewall or Security Settings: Firewalls or security settings may be blocking access to the DNS servers.
  SAP Profile Parameters: Incorrect settings in the SAP profile parameters related to network and hostname resolution.
  
  Solution:
  To resolve the NET022 error, you can follow these steps:
  
  
  Check Hostname Resolution:
  
  Ensure that the hostname you are trying to resolve is correctly defined in the /etc/hosts file (for UNIX/Linux) or in the C:\Windows\System32\drivers\etc\hosts file (for Windows).
  Verify that the DNS server settings are correct and that the DNS servers are reachable.
  
  
  
  Modify the Order of Name Resolution:
  
  On UNIX/Linux systems, you can check the /etc/nsswitch.conf file to see the order of services for hostname resolution. Ensure that it includes the correct order (e.g., hosts: files dns).
  On Windows, you can check the network settings to ensure that DNS is prioritized correctly.
  
  
  
  Check SAP Profile Parameters:
  
  Review the SAP instance profile parameters related to network settings. Look for parameters like rdisp/hostname and rdisp/mshost to ensure they are set correctly.
  
  
  
  Test Connectivity:
  
  Use commands like ping, nslookup, or dig to test the connectivity and resolution of the hostname from the server where the SAP system is running.
  
  
  
  Firewall Settings:
  
  Ensure that there are no firewall rules blocking DNS queries or access to the DNS servers.
  
  
  
  Restart Services:
  
  After making changes, restart the relevant services or the entire SAP system to apply the new configurations.
  
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to NET022 for any specific patches or updates that may address this issue.
  Documentation: Review SAP documentation on network configuration and hostname resolution for best practices.
  Logs: Check the SAP system logs (transaction SM21) for any additional error messages that may provide more context on the issue.
  
  By following these steps, you should be able to diagnose and resolve the NET022 error in your SAP system. If the problem persists, consider reaching out to SAP support for further assistance.