How To Fix SWF_HTTP126 - Error in callback processing

SAP Error Message - Details

• Message type: E = Error

• Message class: SWF_HTTP - Web Services in the Workflow: Server Functions

• Message number: 126

• Message text: Error in callback processing

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 SWF_HTTP126 - Error in callback processing ?

  The SAP error message SWF_HTTP126, which indicates "Error in callback processing," typically occurs in the context of SAP Workflow or when using the HTTP-based communication in SAP systems. This error can arise due to various reasons, including issues with the HTTP request, problems in the callback processing logic, or configuration issues.
  Causes:
  
  Network Issues: Problems with network connectivity between the SAP system and the external service or callback endpoint.
  Incorrect URL: The callback URL may be incorrect or not reachable.
  Authorization Issues: The user or service account may not have the necessary permissions to access the callback URL.
  Service Unavailability: The external service that the callback is trying to reach may be down or not responding.
  Data Format Issues: The data being sent in the callback may not be in the expected format, leading to processing errors.
  Timeouts: The callback processing may be timing out due to long response times from the external service.
  
  Solutions:
  
  Check Network Connectivity: Ensure that the SAP system can reach the callback URL. You can use tools like ping or telnet to test connectivity.
  Verify Callback URL: Double-check the URL configured for the callback to ensure it is correct and accessible.
  Review Authorization: Ensure that the user or service account has the necessary permissions to access the callback endpoint.
  Check External Service Status: Verify that the external service is up and running and can handle requests.
  Inspect Data Format: Ensure that the data being sent in the callback is in the correct format expected by the external service.
  Increase Timeout Settings: If timeouts are an issue, consider increasing the timeout settings for the callback processing in the SAP system.
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to SWF_HTTP126 for any specific patches or updates that may address known issues.
  Transaction Codes: Use transaction codes like SWI1 (Work Item Selection) to monitor workflow instances and identify where the error is occurring.
  Logs and Traces: Review application logs (SLG1) and traces (ST01, ST22) for more detailed error messages that can provide additional context.
  Workflow Configuration: Review the workflow configuration to ensure that all steps are correctly defined and that the callback logic is implemented properly.
  
  If the issue persists after trying the above solutions, it may be beneficial to consult with your SAP Basis or technical team for further investigation or to reach out to SAP support for assistance.