How To Fix CLB2451 - HTTP client: creation failed (return code &1)

SAP Error Message - Details

• Message type: E = Error

• Message class: CLB2 - 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 &V1&.

System Response

The method in process is cancelled.

How to fix this error?

Check the Internet connection system settings, especially the proxy
settings with transaction <DS><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 CLB2451 - HTTP client: creation failed (return code &1) ?

  The SAP error message CLB2451, which states "HTTP client: creation failed (return code &1)," typically indicates that there was an issue with the creation of an HTTP client in the SAP system. This error can arise due to various reasons, and understanding the cause is essential for troubleshooting.
  Causes:
  
  Network Issues: There may be network connectivity problems between the SAP system and the target server.
  Configuration Errors: Incorrect configuration settings in the HTTP client or the destination settings in the SAP system.
  Authorization Issues: The user or service account may not have the necessary permissions to create an HTTP client.
  Resource Limitations: The system may be running out of resources (e.g., memory, threads) to create a new HTTP client.
  Incorrect URL: The URL specified for the HTTP request may be malformed or unreachable.
  Firewall or Proxy Issues: Firewalls or proxy settings may be blocking the HTTP request.
  
  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 SM59 (for RFC destinations). Ensure that the destination is correctly set up.
  Check Authorizations: Ensure that the user or service account has the necessary authorizations to perform HTTP requests.
  Monitor System Resources: Check the system's resource usage (memory, CPU, etc.) to ensure it is not overloaded. You can use transaction SM50 or SM66 to monitor active processes.
  Validate the URL: Double-check the URL being used in the HTTP request to ensure it is correct and accessible.
  Firewall/Proxy Configuration: If applicable, check the firewall and proxy settings to ensure they are not blocking the HTTP requests.
  
  Related Information:
  
  Transaction Codes: 
  
  SOAMANAGER: For managing web service configurations.
  SM59: For managing RFC destinations.
  SICF: For managing HTTP services.
  
  
  Logs and Traces: Check the application logs (transaction SLG1) and HTTP traces (transaction SICF) for more detailed error messages that can provide additional context.
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that may address specific issues related to this error message.
  
  If the issue persists after trying the above solutions, consider reaching out to SAP support for further assistance, providing them with detailed information about the error and the steps you have already taken.