How To Fix D4444 - Unable to determine list of host names

SAP Error Message - Details

• Message type: E = Error

• Message class: D4 - DB2/400 specific messages

• Message number: 444

• Message text: Unable to determine list of host names

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 D4444 - Unable to determine list of host names ?

  The SAP error message D4444, "Unable to determine list of host names," typically occurs in the context of network configuration or when the SAP system is trying to resolve hostnames for communication between different components or systems. Here are some potential causes, solutions, and related information for this error:
  Causes:
  
  DNS Configuration Issues: The system may not be able to resolve hostnames due to incorrect DNS settings or issues with the DNS server.
  Hosts File Misconfiguration: The /etc/hosts file (on Unix/Linux) or C:\Windows\System32\drivers\etc\hosts file (on Windows) may not contain the necessary entries for the hostnames.
  Network Connectivity Problems: There may be network issues preventing the SAP system from reaching the DNS server or the specified hosts.
  SAP Profile Configuration: The SAP instance profile may not be correctly configured to include the necessary hostname information.
  Firewall or Security Settings: Firewalls or security settings may be blocking access to the required network resources.
  
  Solutions:
  
  
  Check DNS Configuration:
  
  Ensure that the DNS server is correctly configured and reachable from the SAP system.
  Use commands like nslookup or ping to verify that the hostnames can be resolved.
  
  
  
  Update Hosts File:
  
  Add the necessary hostname and IP address mappings to the /etc/hosts or hosts file.
  Example entry: 192.168.1.10 hostname.domain.com hostname
  
  
  
  Verify Network Connectivity:
  
  Check the network connection and ensure that the SAP system can communicate with other systems and the DNS server.
  Use tools like ping or traceroute to diagnose connectivity issues.
  
  
  
  Review SAP Profile Settings:
  
  Check the instance profile parameters related to hostname resolution (e.g., rdisp/mshost, rdisp/msserv, etc.).
  Ensure that the parameters are correctly set to point to the appropriate hosts.
  
  
  
  Check Firewall Settings:
  
  Ensure that firewalls are not blocking the necessary ports for SAP communication.
  Review security settings that may restrict access to network resources.
  
  
  
  Restart SAP Services:
  
  Sometimes, simply restarting the SAP services can resolve transient issues related to hostname resolution.
  
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any specific guidance or patches related to this error. SAP frequently updates its knowledge base with solutions for known issues.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they found effective.
  Logs and Traces: Review the SAP system logs (e.g., dev_w0, dev_rfc) for additional error messages or context that may help diagnose the issue.
  
  If the problem persists after trying the above solutions, it may be beneficial to consult with your network administrator or SAP Basis team for further assistance.