How To Fix NET019 - Name resolution of services and port numbers

SAP Error Message - Details

• Message type: E = Error

• Message class: NET - Network Messages

• Message number: 019

• Message text: Name resolution of services and port 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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message NET019 - Name resolution of services and port numbers ?

  The SAP error message NET019, which states "Name resolution of services and port numbers," typically indicates that the SAP system is having trouble resolving the service names or port numbers defined in the services file or in the SAP configuration. This can lead to issues with network connectivity, as the system cannot determine the correct ports to use for communication.
  Causes:
  
  Incorrect Configuration: The SAP system may be configured with incorrect service names or port numbers.
  Missing Entries: The required service names or port numbers may not be present in the services file (usually located at /etc/services on Unix/Linux systems).
  Network Issues: There may be underlying network issues that prevent the SAP system from resolving names correctly.
  DNS Issues: If the system relies on DNS for name resolution, there may be problems with the DNS configuration.
  Firewall or Security Settings: Firewalls or security settings may be blocking access to the required ports.
  
  Solutions:
  
  
  Check the services File:
  
  Ensure that the required service names and port numbers are correctly defined in the /etc/services file. For example, you should have entries like:
  sapdp00  3200/tcp
  sapgw00  3300/tcp
  
  If entries are missing, add them according to your SAP system's configuration.
  
  
  
  Verify SAP Configuration:
  
  Check the SAP profile parameters (e.g., instance profile) to ensure that the correct service names and port numbers are specified.
  Use transaction RZ10 to view and modify profile parameters if necessary.
  
  
  
  Test Network Connectivity:
  
  Use tools like ping, telnet, or nc (netcat) to test connectivity to the required ports.
  Ensure that the SAP server can reach the database and application servers.
  
  
  
  Check DNS Configuration:
  
  If your SAP system relies on DNS, ensure that the DNS settings are correct and that the DNS server is reachable.
  You can test DNS resolution using the nslookup or dig commands.
  
  
  
  Firewall Settings:
  
  Check firewall settings to ensure that the required ports are open and not being blocked.
  If applicable, consult with your network administrator to verify that the necessary rules are in place.
  
  
  
  Restart SAP Services:
  
  After making changes, restart the SAP services to ensure that the new configurations take effect.
  
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to network issues and the specific error message for additional troubleshooting steps and solutions.
  SAP Documentation: Refer to the official SAP documentation for guidance on network configuration and troubleshooting.
  Logs: Review the SAP system logs (e.g., dev_w0, dev_r0) for additional error messages that may provide more context about the issue.
  
  By following these steps, you should be able to diagnose and resolve the NET019 error in your SAP system.