How To Fix RT671 - Unknown host; last test : &4

SAP Error Message - Details

• Message type: E = Error

• Message class: RT - Monitoring infrastructure MSG and alert texts

• Message number: 671

• Message text: Unknown host; last test : &4

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.

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 RT671 - Unknown host; last test : &4 ?

  The SAP error message RT671 "Unknown host; last test: &4" typically indicates that the SAP system is unable to resolve the hostname of a server or service that it is trying to connect to. This can occur in various scenarios, such as when trying to connect to a database, an application server, or any other network resource.
  Causes:
  
  DNS Issues: The hostname cannot be resolved due to DNS configuration problems.
  Network Configuration: The network settings on the SAP server may not be correctly configured, preventing it from reaching the specified host.
  Incorrect Hostname: The hostname specified in the configuration may be incorrect or misspelled.
  Firewall Restrictions: A firewall may be blocking access to the host.
  Host Unavailability: The target host may be down or not reachable due to network issues.
  
  Solutions:
  
  Check Hostname: Verify that the hostname is correct. You can do this by pinging the hostname from the command line of the SAP server.
  ping <hostname>
  
  DNS Configuration: Ensure that the DNS settings are correctly configured. You can check the /etc/resolv.conf file (on Unix/Linux) or the DNS settings in the network configuration on Windows.
  Hosts File: If DNS is not being used, you can add the hostname and its corresponding IP address to the /etc/hosts file (on Unix/Linux) or C:\Windows\System32\drivers\etc\hosts (on Windows).
  Network Connectivity: Check the network connectivity to ensure that the SAP server can reach the target host. Use tools like traceroute or telnet to diagnose connectivity issues.
  Firewall Settings: Review firewall settings to ensure that they are not blocking access to the host.
  Service Availability: Ensure that the service you are trying to connect to is running and available on the target host.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any specific guidance related to this error message. SAP frequently updates its knowledge base with solutions for common issues.
  Logs: Review the SAP application logs (transaction SM21) and system logs for additional context around the error.
  Network Tools: Utilize network diagnostic tools to further investigate connectivity issues, such as nslookup, dig, or network monitoring tools.
  
  If the issue persists after trying the above solutions, it may be beneficial to consult with your network administrator or SAP support for further assistance.