How To Fix NET018 - Name resolution of host names and IP addresses

SAP Error Message - Details

• Message type: E = Error

• Message class: NET - Network Messages

• Message number: 018

• Message text: Name resolution of host names and IP addresses

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 NET018 - Name resolution of host names and IP addresses ?

  The SAP error message NET018 typically indicates a problem with name resolution for host names and IP addresses. This can occur in various scenarios, such as when the SAP system is unable to resolve the hostname of a server or when there are issues with the network configuration.
  Causes of NET018
  
  
  DNS Configuration Issues: The Domain Name System (DNS) may not be properly configured, leading to failures in resolving hostnames to IP addresses.
  
  
  Hosts File Misconfiguration: The local hosts file on the server may not contain the correct mappings for the hostname.
  
  
  Network Connectivity Problems: There may be issues with the network connection, such as firewalls blocking traffic or network outages.
  
  
  Incorrect SAP Configuration: The SAP system may be configured with incorrect hostnames or IP addresses.
  
  
  Service Not Running: The DNS service may not be running or may be misconfigured.
  
  
  Solutions to NET018
  
  
  Check DNS Configuration:
  
  Ensure that the DNS server settings are correct and that the DNS server is reachable.
  Use tools like nslookup or dig to verify that the hostname can be resolved correctly.
  
  
  
  Update the Hosts File:
  
  Check the /etc/hosts file (on Unix/Linux) or C:\Windows\System32\drivers\etc\hosts (on Windows) to ensure that the hostname is correctly mapped to the appropriate IP address.
  
  
  
  Verify Network Connectivity:
  
  Check the network connection to ensure that the server can communicate with the DNS server and other necessary hosts.
  Use ping to test connectivity to the hostname and IP address.
  
  
  
  Review SAP Configuration:
  
  Check the SAP profile parameters (like rdisp/mshost, rdisp/msserv, etc.) to ensure that they are set correctly.
  Ensure that the SAP instance is configured to use the correct hostname.
  
  
  
  Restart DNS Services:
  
  If you suspect that the DNS service is not functioning correctly, try restarting it.
  
  
  
  Firewall Settings:
  
  Ensure that firewalls are not blocking DNS queries or traffic to the SAP system.
  
  
  
  Related Information
  
  SAP Notes: Check SAP Notes related to NET018 for any specific patches or updates that may address the issue.
  Logs: Review the SAP system logs (transaction SM21) and the operating system logs for any additional error messages that may provide more context.
  Network Tools: Utilize network diagnostic tools to trace the route to the hostname and identify where the resolution is failing.
  
  By following these steps, you should be able to diagnose and resolve the NET018 error in your SAP environment. If the problem persists, consider reaching out to your network administrator or SAP support for further assistance.