How To Fix CNVMBTRFC049 - Determination of host name from the IP number failed

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 049

• Message text: Determination of host name from the IP number 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.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNVMBTRFC049 - Determination of host name from the IP number failed ?

  The SAP error message CNVMBTRFC049 indicates that the system is unable to resolve a hostname from an IP address. This typically occurs in scenarios involving Remote Function Calls (RFC) where the system needs to establish a connection to another system using its IP address, but cannot determine the corresponding hostname.
  Causes:
  
  DNS Configuration Issues: The Domain Name System (DNS) may not be properly configured, leading to the inability to resolve the IP address to a hostname.
  Hosts File Misconfiguration: The /etc/hosts file (on Unix/Linux systems) or C:\Windows\System32\drivers\etc\hosts file (on Windows systems) may not contain the necessary entries for the IP address.
  Network Issues: There may be network connectivity issues preventing the system from reaching the DNS server.
  Firewall Restrictions: Firewalls may be blocking DNS queries or responses.
  Incorrect IP Address: The IP address being used may be incorrect or not reachable.
  
  Solutions:
  
  
  Check DNS Configuration:
  
  Ensure that the DNS server settings are correctly configured in the SAP system.
  Test DNS resolution using command-line tools (e.g., nslookup or ping) to verify that the hostname can be resolved from the IP address.
  
  
  
  Update Hosts File:
  
  If DNS is not being used or is unreliable, consider adding the IP address and corresponding hostname to the /etc/hosts file (Linux/Unix) or the hosts file (Windows).
  Example entry: 192.168.1.10 hostname.example.com
  
  
  
  Network Connectivity:
  
  Check network connectivity to ensure that the SAP system can reach the DNS server.
  Use tools like ping or traceroute to diagnose network issues.
  
  
  
  Firewall Settings:
  
  Review firewall settings to ensure that DNS traffic (typically UDP port 53) is allowed.
  
  
  
  Verify IP Address:
  
  Double-check the IP address being used in the RFC destination configuration to ensure it is correct and reachable.
  
  
  
  SAP Notes:
  
  Check for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  
  
  
  Related Information:
  
  RFC Destination Configuration: Ensure that the RFC destination is correctly configured in transaction SM59.
  SAP Kernel Version: Sometimes, issues may arise due to bugs in specific kernel versions. Ensure that you are running a supported and updated version of the SAP kernel.
  System Logs: Review system logs (transaction SM21) for any additional error messages that may provide more context about the issue.
  
  By following these steps, you should be able to diagnose and resolve the CNVMBTRFC049 error in your SAP environment.