How To Fix 0D646 - RFC not started due to system error &1

SAP Error Message - Details

• Message type: E = Error

• Message class: 0D - FS-CD General Messages

• Message number: 646

• Message text: RFC not started due to system error &1

What causes this issue?

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

System Response

How to fix this error?

INCLUDE NA_SYSADMIN1 OBJECT DOKU ID TX LANGUAGE EN

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message 0D646 - RFC not started due to system error &1 ?

  The SAP error message "0D646 RFC not started due to system error &1" typically indicates that there is an issue with the Remote Function Call (RFC) connection in the SAP system. This error can arise due to various reasons, including configuration issues, system resource problems, or network issues.
  Causes:
  
  Configuration Issues: Incorrect settings in the RFC destination or in the SAP system configuration can lead to this error.
  System Resource Problems: Insufficient memory, CPU, or other system resources can prevent the RFC from starting.
  Network Issues: Problems with network connectivity between the SAP systems can also cause this error.
  Authorization Issues: The user or service account may not have the necessary permissions to establish the RFC connection.
  Background Jobs: If there are background jobs that are consuming too many resources, it may prevent the RFC from starting.
  System Errors: General system errors or inconsistencies in the SAP environment can also lead to this issue.
  
  Solutions:
  
  
  Check RFC Configuration:
  
  Go to transaction SM59 and verify the settings of the RFC destination. Ensure that the connection parameters are correct.
  Test the connection from SM59 to see if it is working properly.
  
  
  
  Monitor System Resources:
  
  Use transaction SM50 or SM66 to check for any long-running processes or jobs that may be consuming resources.
  Check system logs for any memory or CPU-related issues.
  
  
  
  Check Network Connectivity:
  
  Ensure that there are no network issues between the SAP systems. You can use tools like ping or traceroute to check connectivity.
  Verify firewall settings to ensure that the necessary ports for RFC communication are open.
  
  
  
  Review Authorization:
  
  Ensure that the user or service account used for the RFC connection has the necessary authorizations. You can check this in transaction SU01.
  
  
  
  Check System Logs:
  
  Use transaction SM21 to review the system logs for any related error messages that could provide more context on the issue.
  
  
  
  Restart the SAP System:
  
  If the issue persists and is related to system resources or background jobs, consider restarting the SAP system or the affected instance.
  
  
  
  Consult SAP Notes:
  
  Check the SAP Support Portal for any relevant SAP Notes that may address this specific error message or provide additional troubleshooting steps.
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  SM59: RFC Destinations
  SM50: Work Process Overview
  SM66: Global Work Process Overview
  SM21: System Log
  SU01: User Maintenance
  
  
  
  SAP Support: If the issue cannot be resolved with the above steps, consider reaching out to SAP Support for further assistance, providing them with detailed logs and error messages.
  
  
  By following these steps, you should be able to identify and resolve the cause of the "0D646 RFC not started due to system error &1" message in your SAP system.