How To Fix NET012 - Resolution of host names to IP address

SAP Error Message - Details

• Message type: E = Error

• Message class: NET - Network Messages

• Message number: 012

• Message text: Resolution of host names 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 NET012 - Resolution of host names to IP address ?

  The SAP error message NET012 typically indicates an issue with the resolution of host names to IP addresses. This can occur in various scenarios, such as when the SAP system is trying to connect to a database, application server, or any other network resource, and it cannot resolve the hostname to an IP address.
  Cause:
  
  DNS Configuration Issues: The Domain Name System (DNS) may not be configured correctly, or the DNS server may be down or unreachable.
  Hosts File Misconfiguration: The local hosts file may not contain the correct mappings for the hostname.
  Network Connectivity Issues: There may be network issues preventing the SAP system from reaching the DNS server or the target host.
  Firewall or Security Settings: Firewalls or security settings may be blocking DNS queries or access to the target host.
  Incorrect Hostname: The hostname being used may be incorrect or misspelled.
  
  Solution:
  
  
  Check DNS Configuration:
  
  Ensure that the DNS server settings are correct in the network configuration of the SAP system.
  Test DNS resolution using command-line tools like nslookup or ping to see if the hostname can be resolved.
  
  
  
  Verify the Hosts File:
  
  Check the local hosts file (usually located at /etc/hosts on Unix/Linux or C:\Windows\System32\drivers\etc\hosts on Windows) to ensure that the hostname is correctly mapped to the appropriate IP address.
  
  
  
  Network Connectivity:
  
  Ensure that the SAP system has network connectivity to the DNS server and the target host. You can use tools like ping or traceroute to diagnose connectivity issues.
  
  
  
  Firewall Settings:
  
  Check firewall settings to ensure that DNS traffic (usually on port 53) is allowed and that there are no rules blocking access to the target host.
  
  
  
  Correct Hostname:
  
  Double-check the hostname being used in the SAP configuration to ensure it is correct and properly formatted.
  
  
  
  Restart Network Services:
  
  Sometimes, restarting network services or the SAP system itself can resolve transient issues.
  
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to network issues and hostname resolution for specific guidance and troubleshooting steps.
  SAP Community: The SAP Community forums can be a valuable resource for finding similar issues and solutions shared by other users.
  Network Tools: Familiarize yourself with network diagnostic tools (like nslookup, ping, traceroute, etc.) to help troubleshoot connectivity and resolution issues.
  
  If the problem persists after trying the above solutions, it may be necessary to involve your network administrator or SAP support for further assistance.