How To Fix CNVMBTRFC051 - Determination of IP number from Host name failed

SAP Error Message - Details

• Message type: E = Error

• Message class: CNVMBTRFC - Messages used in RFC Management and its objects

• Message number: 051

• Message text: Determination of IP number from Host name failed

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 CNVMBTRFC051 - Determination of IP number from Host name failed ?

  The SAP error message CNVMBTRFC051 indicates that there is a problem with the determination of the IP address from a given host name. This error typically occurs in the context of Remote Function Calls (RFC) when the system is unable to resolve the host name to an IP address.
  Causes:
  
  DNS Issues: The most common cause is a failure in the Domain Name System (DNS) resolution. The host name may not be correctly configured in the DNS server, or the DNS server may be unreachable.
  Incorrect Host Name: The host name specified in the configuration may be incorrect or misspelled.
  Network Configuration: There may be network issues preventing the SAP system from reaching the DNS server or the specified host.
  Hosts File: The /etc/hosts file (on Unix/Linux systems) or C:\Windows\System32\drivers\etc\hosts file (on Windows systems) may not contain the correct mapping for the host name.
  Firewall or Security Settings: Firewalls or security settings may be blocking access to the DNS server or the host.
  
  Solutions:
  
  Check Host Name: Verify that the host name is correct and properly spelled in the configuration.
  DNS Configuration: Ensure that the DNS server is correctly configured and reachable. You can use commands like nslookup or ping to test the resolution of the host name.
  Update Hosts File: If DNS resolution is not working, consider adding the host name and its corresponding IP address to the /etc/hosts or hosts file.
  Network Connectivity: Check the network connectivity to ensure that the SAP system can reach the DNS server and the target host.
  Firewall Settings: Review firewall settings to ensure that they are not blocking DNS queries or access to the target host.
  SAP Configuration: In the SAP system, check the RFC destination configuration to ensure that it is set up correctly.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  System Logs: Review the system logs (transaction SM21) for any additional error messages or warnings that may provide more context.
  Network Tools: Utilize network diagnostic tools to trace the route to the host and identify any potential issues along the way.
  
  By following these steps, you should be able to diagnose and resolve the CNVMBTRFC051 error in your SAP environment.