How To Fix NET020 - Name resolution of network names and network addresses

SAP Error Message - Details

• Message type: E = Error

• Message class: NET - Network Messages

• Message number: 020

• Message text: Name resolution of network names and network addresses

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 NET020 - Name resolution of network names and network addresses ?

  The SAP error message NET020 indicates a problem with name resolution of network names and network addresses. This error typically arises when the SAP system is unable to resolve the hostname or network address of a server or service it is trying to connect to. Here are the potential causes, solutions, and related information for this error:
  Causes:
  
  DNS Issues: The Domain Name System (DNS) may not be configured correctly, or the DNS server may be down or unreachable.
  Hosts File Configuration: 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.
  Network Connectivity: There may be network connectivity issues preventing the SAP system from reaching the DNS server or the target host.
  Firewall Settings: 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 network names.
  Incorrect SAP Router Configuration: If using an SAP router, it may not be configured correctly to handle the requests.
  
  Solutions:
  
  
  Check DNS Configuration:
  
  Verify that the DNS server is reachable and functioning correctly.
  Use commands like nslookup or ping to test the resolution of the hostname.
  
  
  
  Update Hosts File:
  
  Ensure that the hostname and IP address of the target server are correctly listed in the hosts file.
  Add entries if necessary.
  
  
  
  Network Connectivity:
  
  Check the network connection between the SAP system and the DNS server or target host.
  Use tools like ping or traceroute to diagnose connectivity issues.
  
  
  
  Firewall Configuration:
  
  Review firewall settings to ensure that they are not blocking DNS queries or traffic to the target host.
  
  
  
  SAP Profile Settings:
  
  Check the instance profile parameters related to network settings (e.g., rdisp/mshost, rdisp/msserv, etc.) to ensure they are correctly configured.
  
  
  
  SAP Router Configuration:
  
  If using an SAP router, verify that it is correctly set up and that the routing rules allow for the necessary connections.
  
  
  
  Restart Services:
  
  Sometimes, simply restarting the SAP services or the server can resolve transient issues.
  
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to NET020 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 (e.g., dev_w0, dev_rfc) for additional error messages or context that may help diagnose the issue.
  
  By systematically checking these areas, you should be able to identify and resolve the cause of the NET020 error in your SAP environment.