How To Fix SCLNT_HTTP417 - Unknown host name (ICM_HTTP_HOST_UNKNOWN)

SAP Error Message - Details

• Message type: E = Error

• Message class: SCLNT_HTTP - Messages for HTTP Client for Respective Error Code

• Message number: 417

• Message text: Unknown host name (ICM_HTTP_HOST_UNKNOWN)

What causes this issue?

The host name is unknown.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Make sure that the specified server is visible and reachable. One
possible cause of the error is that the specified server can only be
reached through a proxy. In this case, set up the connection through a
proxy.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message SCLNT_HTTP417 - Unknown host name (ICM_HTTP_HOST_UNKNOWN) ?

  The SAP error message SCLNT_HTTP417 with the description "Unknown host name (ICM_HTTP_HOST_UNKNOWN)" typically indicates that the SAP system is unable to resolve the hostname specified in the HTTP request. This can occur for various reasons, including DNS issues, incorrect configuration, or network problems.
  Causes:
  
  Incorrect Hostname: The hostname specified in the URL may be incorrect or misspelled.
  DNS Resolution Issues: The DNS server may not be able to resolve the hostname to an IP address.
  Network Configuration: There may be network issues preventing the SAP system from reaching the DNS server or the specified host.
  SAP Configuration: The SAP system may not be properly configured to handle the request for the specified hostname.
  Firewall or Security Settings: Firewalls or security settings may be blocking access to the specified hostname.
  
  Solutions:
  
  Check Hostname: Verify that the hostname in the URL is correct. Ensure there are no typos or incorrect entries.
  DNS Configuration:
  
  Check the DNS settings on the server where the SAP system is running.
  Use commands like nslookup or ping to test if the hostname can be resolved from the server.
  
  
  Network Connectivity: Ensure that the SAP server has network connectivity and can reach the DNS server and the target host.
  SAP HTTP Configuration:
  
  Check the SAP instance profile parameters related to HTTP and ensure they are correctly set.
  Review the transaction SICF to ensure that the HTTP services are correctly configured and activated.
  
  
  Firewall Settings: If applicable, check firewall settings to ensure that they are not blocking access to the hostname.
  Hosts File: As a temporary workaround, 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 file (on Windows) to bypass DNS resolution.
  
  Related Information:
  
  Transaction Codes: You may want to use transaction codes like SICF (to manage HTTP services) and SMICM (to monitor the ICM) to troubleshoot further.
  Logs: Check the ICM logs for more detailed error messages that can provide additional context about the issue.
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that may address specific issues related to the error message.
  
  If the problem persists after trying the above solutions, consider reaching out to your network administrator or SAP support for further assistance.