How To Fix NET027 - Performance during name resolution

SAP Error Message - Details

• Message type: E = Error

• Message class: NET - Network Messages

• Message number: 027

• Message text: Performance during 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 NET027 - Performance during name resolution ?

  The SAP error message NET027, which indicates "Performance during name resolution," typically arises when there are issues related to the resolution of hostnames or network addresses in an SAP environment. This can lead to performance degradation or delays in communication between SAP systems and other network resources.
  Causes of NET027
  
  DNS Configuration Issues: Problems with the Domain Name System (DNS) configuration can lead to slow or failed hostname resolution.
  Network Latency: High latency in the network can cause delays in resolving hostnames.
  Incorrect Host Entries: Incorrect or missing entries in the hosts file or DNS can lead to resolution failures.
  Firewall or Security Settings: Firewalls or security settings may block DNS queries or responses.
  Overloaded DNS Servers: If the DNS server is overloaded or experiencing issues, it may not respond quickly to queries.
  Network Configuration: Misconfigured network settings on the SAP server or client can lead to resolution issues.
  
  Solutions to NET027
  
  
  Check DNS Configuration:
  
  Ensure that the DNS servers are correctly configured in the SAP system settings.
  Verify that the DNS servers are reachable from the SAP application server.
  
  
  
  Test Name Resolution:
  
  Use command-line tools (like nslookup or ping) to test the resolution of hostnames from the SAP server.
  Check if the hostname resolves correctly and within an acceptable time frame.
  
  
  
  Review Hosts File:
  
  Check the /etc/hosts file (on Unix/Linux) or C:\Windows\System32\drivers\etc\hosts (on Windows) for any incorrect or missing entries.
  Add necessary entries if required.
  
  
  
  Monitor Network Performance:
  
  Use network monitoring tools to check for latency or packet loss that may affect name resolution.
  Investigate and resolve any network issues.
  
  
  
  Check Firewall Settings:
  
  Ensure that the firewall settings allow DNS traffic (typically UDP port 53).
  Verify that there are no security policies blocking DNS queries.
  
  
  
  Optimize DNS Server Performance:
  
  If using a local DNS server, ensure it is not overloaded and is functioning correctly.
  Consider using a more reliable or faster DNS service if necessary.
  
  
  
  SAP Notes and Support:
  
  Check for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  If the issue persists, consider reaching out to SAP support for further assistance.
  
  
  
  Related Information
  
  SAP Documentation: Review SAP's official documentation for network configuration and performance tuning.
  System Logs: Check the SAP system logs (transaction SM21) for any related error messages that may provide additional context.
  Performance Monitoring: Use transaction ST03N to analyze performance metrics and identify any bottlenecks related to name resolution.
  
  By addressing the underlying causes and implementing the suggested solutions, you can mitigate the NET027 error and improve the performance of name resolution in your SAP environment.