How To Fix SWF_HTTP002 - Communication error in RFC in the workflow system

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 002

• Message text: Communication error in RFC in the workflow system

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message SWF_HTTP002 - Communication error in RFC in the workflow system ?

  The SAP error message SWF_HTTP002 indicates a communication error in the Remote Function Call (RFC) within the workflow system. This error typically arises when there are issues with the communication between the SAP system and an external system or service, often related to workflow processing.
  Causes of SWF_HTTP002
  
  Network Issues: Problems with the network connection between the SAP system and the external service can lead to communication errors.
  RFC Destination Configuration: Incorrect configuration of the RFC destination in the SAP system can cause failures in communication.
  Service Unavailability: The external service that the workflow is trying to communicate with may be down or not reachable.
  Authorization Issues: The user or service account used for the RFC call may not have the necessary authorizations to access the external service.
  Timeouts: The request may be timing out due to long processing times or network latency.
  Incorrect URL or Endpoint: The URL or endpoint configured for the external service may be incorrect or outdated.
  
  Solutions to SWF_HTTP002
  
  
  Check Network Connectivity: Ensure that the network connection between the SAP system and the external service is stable and functioning correctly. You can use tools like ping or traceroute to diagnose network issues.
  
  
  Verify RFC Destination:
  
  Go to transaction SM59 in the SAP GUI.
  Check the configuration of the RFC destination used in the workflow.
  Test the connection to ensure it is working correctly.
  
  
  
  Check External Service Availability: Verify that the external service is up and running. You can do this by trying to access the service directly through a web browser or using tools like curl or Postman.
  
  
  Review Authorizations: Ensure that the user or service account used for the RFC call has the necessary authorizations to access the external service.
  
  
  Increase Timeout Settings: If timeouts are an issue, consider increasing the timeout settings for the RFC call in the configuration.
  
  
  Validate URL/Endpoint: Double-check the URL or endpoint configured for the external service to ensure it is correct and accessible.
  
  
  Check SAP Notes: Look for any relevant SAP Notes that may address known issues or provide patches related to the SWF_HTTP002 error.
  
  
  Review Workflow Logs: Check the workflow logs for additional details about the error. You can use transaction SWI1 to analyze workflow instances and see if there are any specific error messages or details.
  
  
  Related Information
  
  Transaction Codes:
  
  SM59: RFC Destinations
  SWI1: Work Item Selection
  SWI2_DIAG: Workflow Diagnosis
  
  
  SAP Notes: Search for SAP Notes related to SWF_HTTP002 for any specific fixes or recommendations.
  Documentation: Review SAP documentation on workflow and RFC communication for best practices and troubleshooting steps.
  
  By following these steps, you should be able to diagnose and resolve the SWF_HTTP002 error in your SAP workflow system.