How To Fix NET004 - Name resolution of host names, IP addresses, services, and so on

SAP Error Message - Details

• Message type: E = Error

• Message class: NET - Network Messages

• Message number: 004

• Message text: Name resolution of host names, IP addresses, services, and so on

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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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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message NET004 - Name resolution of host names, IP addresses, services, and so on ?

  The SAP error message NET004 typically indicates a problem with name resolution in the SAP system. This error can occur when the SAP system is unable to resolve hostnames, IP addresses, or services, which can prevent the system from connecting to other services or systems.
  Causes of NET004 Error
  
  DNS Issues: The Domain Name System (DNS) may not be configured correctly, or the DNS server may be unreachable.
  Hosts File Misconfiguration: The /etc/hosts file (on Unix/Linux) or C:\Windows\System32\drivers\etc\hosts file (on Windows) may not contain the correct entries for the hostname or IP address.
  Network Connectivity Problems: There may be network issues preventing the SAP system from reaching the DNS server or the target host.
  Firewall Restrictions: Firewalls may be blocking the necessary ports or protocols required for name resolution.
  SAP Profile Configuration: The SAP instance profile may not be configured correctly, leading to issues in resolving hostnames.
  Incorrect SAP Router Configuration: If using an SAP router, it may not be configured correctly to allow name resolution.
  
  Solutions to NET004 Error
  
  
  Check DNS Configuration:
  
  Ensure that the DNS server is reachable from the SAP server.
  Use commands like nslookup or dig to verify that the hostname can be resolved correctly.
  
  
  
  Verify Hosts File:
  
  Check the /etc/hosts or hosts file for the correct entries. Ensure that the hostname and IP address mappings are correct.
  Add any missing entries that are required for the SAP system to function properly.
  
  
  
  Test Network Connectivity:
  
  Use ping to check if the target host is reachable.
  Ensure that there are no network issues or outages affecting connectivity.
  
  
  
  Check Firewall Settings:
  
  Review firewall rules to ensure that they are not blocking DNS queries or traffic to the required hosts.
  
  
  
  Review SAP Profile Parameters:
  
  Check the instance profile parameters related to network settings. Ensure that parameters like rdisp/mshost, rdisp/msserv, and rdisp/trace are correctly set.
  
  
  
  SAP Router Configuration:
  
  If using an SAP router, verify that it is configured correctly and that it allows the necessary traffic for name resolution.
  
  
  
  Restart Services:
  
  Sometimes, simply restarting the SAP instance or the DNS service can resolve transient issues.
  
  
  
  Related Information
  
  SAP Notes: Check SAP Notes related to NET004 for any specific patches or updates that may address known issues.
  SAP Community: Engage with the SAP Community forums for insights from other users who may have encountered similar issues.
  Logs: Review the SAP system logs (transaction SM21) 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 NET004 error in your SAP system.