How To Fix NET028 - Time required to resolve host name to IP address

SAP Error Message - Details

• Message type: E = Error

• Message class: NET - Network Messages

• Message number: 028

• Message text: Time required to resolve host name to IP address

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 NET028 - Time required to resolve host name to IP address ?

  The SAP error message NET028 indicates that there is a problem with resolving a hostname to an IP address. This can occur in various scenarios, such as when trying to connect to an SAP system or when the system is attempting to communicate with other services or databases.
  Cause:
  
  DNS Issues: The most common cause is a problem with the Domain Name System (DNS) configuration. The hostname may not be correctly registered in the DNS, or the DNS server may be unreachable.
  Network Configuration: Incorrect network settings on the SAP server or client machine can lead to hostname resolution failures.
  Hosts File: The local hosts file may not contain the necessary entries for hostname resolution.
  Firewall or Security Settings: Firewalls or security settings may be blocking DNS queries or responses.
  Network Connectivity: There may be general network connectivity issues that prevent the SAP system from reaching the DNS server.
  
  Solution:
  
  
  Check DNS Configuration:
  
  Verify that the DNS server settings are correct on the SAP server and client machines.
  Use tools like nslookup or ping to check if the hostname can be resolved to an IP address.
  
  
  
  Update Hosts File:
  
  If DNS is not being used or is unreliable, consider adding the hostname and corresponding IP address to the local hosts file (located at /etc/hosts on Unix/Linux or C:\Windows\System32\drivers\etc\hosts on Windows).
  
  
  
  Network Configuration:
  
  Ensure that the network configuration (IP address, subnet mask, gateway) is correct on the SAP server and client machines.
  
  
  
  Firewall Settings:
  
  Check firewall settings to ensure that DNS traffic (typically UDP port 53) is allowed.
  
  
  
  Test Network Connectivity:
  
  Use tools like ping or traceroute to test connectivity to the DNS server and the target hostname.
  
  
  
  Check SAP Configuration:
  
  Review the SAP system configuration to ensure that the correct hostname is being used in the connection settings.
  
  
  
  Consult Logs:
  
  Check the SAP logs for any additional error messages or information that may provide more context about the issue.
  
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any specific guidance or patches related to this error message.
  Network Tools: Familiarize yourself with network diagnostic tools (e.g., nslookup, ping, traceroute, telnet) to troubleshoot connectivity issues.
  Documentation: Review SAP documentation for network configuration and troubleshooting best practices.
  
  By following these steps, you should be able to identify and resolve the underlying issue causing the NET028 error in your SAP environment.