How To Fix S_UNIFIED_CON_API190 - Unknown host name &1

SAP Error Message - Details

• Message type: E = Error

• Message class: S_UNIFIED_CON_API - Messages for API for Unified Connectivity

• Message number: 190

• Message text: Unknown host name &1

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 S_UNIFIED_CON_API190 - Unknown host name &1 ?

  The SAP error message S_UNIFIED_CON_API190 Unknown host name &1 typically indicates that the system is unable to resolve the hostname specified in the error message. This can occur in various scenarios, such as when trying to connect to a database, an external service, or another SAP system.
  Causes:
  
  Incorrect Hostname: The hostname specified in the configuration is incorrect or misspelled.
  DNS Issues: The DNS server is unable to resolve the hostname to an IP address.
  Network Issues: There may be network connectivity issues preventing access to the specified host.
  Configuration Errors: The SAP system configuration may not be set up correctly, leading to the inability to find the host.
  Firewall Restrictions: A firewall may be blocking access to the specified hostname.
  
  Solutions:
  
  
  Verify Hostname: Check the hostname in the configuration settings and ensure it is correct. You can do this by pinging the hostname from the command line to see if it resolves to an IP address.
  ping <hostname>
  
  
  Check DNS Configuration: Ensure that the DNS settings on the server where SAP is running are correctly configured. You can check the /etc/resolv.conf file on Unix/Linux systems or the DNS settings in the network configuration on Windows.
  
  
  Test Network Connectivity: Use tools like ping, traceroute, or telnet to test connectivity to the hostname. This can help identify if there are any network issues.
  
  
  Review SAP Configuration: Check the relevant SAP configuration settings (like RFC destinations, database connections, etc.) to ensure that the hostname is correctly specified.
  
  
  Firewall Settings: If applicable, check the firewall settings to ensure that traffic to and from the specified hostname is allowed.
  
  
  Consult SAP Notes: Look for any relevant SAP Notes or documentation that might address this specific error message or provide additional troubleshooting steps.
  
  
  Related Information:
  
  SAP Basis Team: If you are unable to resolve the issue, it may be helpful to involve your SAP Basis team, as they can provide insights into system configurations and network settings.
  Logs and Traces: Check the SAP system logs (transaction SM21) and traces (transaction ST22) for any additional error messages that might provide more context about the issue.
  SAP Community: Consider searching or posting in the SAP Community forums for additional insights from other users who may have encountered similar issues.
  
  By following these steps, you should be able to identify and resolve the cause of the S_UNIFIED_CON_API190 error in your SAP system.