How To Fix CLB451 - HTTP client: creation failed (return code &1)

SAP Error Message - Details

• Message type: E = Error

• Message class: CLB - SAIL: Common messages

• Message number: 451

• Message text: HTTP client: creation failed (return code &1)

What causes this issue?

There was an error when creating the HTTP client. The return code from
the class CL_HTTP_CLIENT is &syst-msgv1&.

System Response

The method in process will be cancelled.

How to fix this error?

Check the system settings for the internet connection, especially the
proxy settings with transaction <DS:TRAN.SMICM>SMICM</>.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CLB451 - HTTP client: creation failed (return code &1) ?

  The SAP error message CLB451 indicates that there was a failure in creating an HTTP client, and it typically includes a return code that provides more context about the nature of the failure. Here’s a breakdown of the potential causes, solutions, and related information for this error:
  Causes:
  
  Network Issues: The system may be unable to reach the target server due to network problems, such as DNS resolution issues, firewall restrictions, or incorrect URLs.
  Configuration Errors: Incorrect configuration settings in the HTTP client settings, such as incorrect proxy settings or missing authentication credentials.
  Resource Limitations: The system may be running out of resources (e.g., memory, file descriptors) that are required to create a new HTTP client instance.
  SAP Kernel Issues: There may be bugs or issues in the SAP kernel version being used that affect HTTP client functionality.
  Authorization Issues: The user or service account may not have the necessary permissions to create an HTTP client.
  
  Solutions:
  
  Check Network Connectivity: Ensure that the SAP system can reach the target server. You can use tools like ping or telnet to test connectivity.
  Review Configuration Settings: Verify the HTTP client configuration in transaction SOAMANAGER or relevant configuration transactions. Ensure that the URL, proxy settings, and authentication details are correct.
  Monitor System Resources: Check the system's resource usage to ensure that it is not running out of memory or other resources. You can use transaction SM50 or SM66 to monitor active processes.
  Update SAP Kernel: If you suspect a kernel issue, consider updating to the latest version of the SAP kernel, as newer versions may contain bug fixes.
  Check Authorizations: Ensure that the user or service account has the necessary authorizations to perform HTTP client operations. You can check this in transaction SU53 after the error occurs.
  
  Related Information:
  
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that may address specific issues related to the CLB451 error.
  Transaction Codes: Familiarize yourself with transaction codes like SMICM (ICM Monitor) and SICF (HTTP Service Hierarchy) to monitor and manage HTTP services.
  Logs and Traces: Check the application logs (transaction SLG1) and HTTP traces (transaction SMICM -> Go to Trace) for more detailed error messages that can provide additional context.
  
  If the issue persists after trying the above solutions, consider reaching out to SAP support for further assistance, providing them with the return code and any relevant logs or traces.