How To Fix CLB2452 - HTTP client: &1 failed with return code &2 and message &3

SAP Error Message - Details

• Message type: E = Error

• Message class: CLB2 - SAIL: Common messages

• Message number: 452

• Message text: HTTP client: &1 failed with return code &2 and message &3

What causes this issue?

The return code &V2& from the HTTP client signals that something went
wrong while performing a &V1& action.
The extended message reads: &V3&.

System Response

Communication is not established.

How to fix this error?

Retry at a later time. If no connection is possible, contact your system
administrator.

Procedure for System Administrators

Check the HTTP connection in the IC Manager (transaction <DS>
<DS:TRAN.SICF>SICF</></>.
The relevant proxy port and host for the given target platform are
defined in the <DS><DS:TRAN.CLB2_PLATF>Server Settings</></>.
The timeout for HTTP requests can be defined in the <DS>
<DS:TRAN.CLB2_APPLI_PLATF>Application-Specific Server Settings</></>.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CLB2452 - HTTP client: &1 failed with return code &2 and message &3 ?

  The SAP error message CLB2452 indicates that there was an issue with an HTTP client request, where the request failed with a specific return code and message. This error typically arises in scenarios involving HTTP communication, such as when SAP is trying to connect to an external web service or API.
  Cause:
  The error message CLB2452 can be caused by several factors, including:
  
  Network Issues: Problems with the network connection between the SAP system and the target server.
  Incorrect URL: The URL being accessed may be incorrect or malformed.
  Authentication Issues: The target server may require authentication, and the credentials provided may be incorrect or missing.
  Server Unavailability: The target server may be down or not reachable.
  Firewall Restrictions: Firewalls may be blocking the HTTP request.
  SSL/TLS Issues: If the connection is over HTTPS, there may be issues with SSL certificates or protocols.
  Return Code Interpretation: The return code (&2) can provide specific insights into the nature of the failure (e.g., 404 for not found, 500 for server error, etc.).
  
  Solution:
  To resolve the CLB2452 error, you can take the following steps:
  
  Check Network Connectivity: Ensure that the SAP system can reach the target server. You can use tools like ping or telnet to test connectivity.
  Verify the URL: Double-check the URL being used in the HTTP request for correctness.
  Review Authentication: If the target service requires authentication, ensure that the correct credentials are being used and that they are properly configured in SAP.
  Check Server Status: Verify that the target server is up and running and that the service you are trying to access is available.
  Inspect Firewall Settings: Ensure that there are no firewall rules blocking the HTTP request from the SAP system to the target server.
  Examine SSL/TLS Configuration: If using HTTPS, check the SSL certificates and ensure that the correct protocols are enabled in the SAP system.
  Analyze Return Code: Look up the specific return code (&2) in the documentation or online resources to understand the exact nature of the error.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or patches related to HTTP communication errors.
  Transaction Codes: Use transaction codes like SMICM to monitor HTTP connections and SICF to manage HTTP services.
  Logs: Review the application logs (transaction SLG1) for more detailed error messages that can provide additional context.
  Documentation: Refer to the SAP documentation for the specific HTTP client or service you are using for more detailed troubleshooting steps.
  
  By following these steps, you should be able to identify and resolve the underlying issue causing the CLB2452 error in your SAP system.