How To Fix /SMB/CM_API_COMMON257 - Wrong RFC Connection

SAP Error Message - Details

• Message type: E = Error

• Message class: /SMB/CM_API_COMMON -

• Message number: 257

• Message text: Wrong RFC Connection

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SMB/CM_API_COMMON257 - Wrong RFC Connection ?

  The SAP error message /SMB/CM_API_COMMON257 Wrong RFC Connection typically indicates that there is an issue with the Remote Function Call (RFC) connection being used in the SAP system. This error can occur in various scenarios, particularly when trying to connect to an external system or service.
  Causes:
  
  Incorrect RFC Destination: The RFC destination configured in the SAP system may be incorrect or not properly set up.
  Network Issues: There may be network connectivity issues between the SAP system and the target system.
  Authorization Issues: The user credentials used for the RFC connection may not have the necessary authorizations.
  Configuration Errors: There may be misconfigurations in the RFC settings, such as incorrect parameters or missing entries.
  Service Unavailability: The target service or system may be down or not reachable.
  
  Solutions:
  
  
  Check RFC Destination:
  
  Go to transaction SM59 in the SAP GUI.
  Verify the settings of the RFC destination being used. Ensure that the connection type, target host, and system number are correct.
  Test the connection using the "Connection Test" button to see if it is successful.
  
  
  
  Network Connectivity:
  
  Ensure that there are no firewall rules or network issues preventing access to the target system.
  Use tools like ping or telnet to check connectivity to the target host.
  
  
  
  User Authorizations:
  
  Check the user credentials being used for the RFC connection. Ensure that the user has the necessary authorizations to perform the required actions.
  You can check user roles and authorizations in transaction SU01.
  
  
  
  Review Configuration:
  
  Review the configuration settings in SM59 for any missing or incorrect parameters.
  Ensure that the target system is correctly defined and that all required fields are filled out.
  
  
  
  Check Target System:
  
  Verify that the target system is up and running. If it is down, you may need to contact the system administrator for that system.
  
  
  
  Logs and Traces:
  
  Check the SAP system logs (transaction SM21) and the developer traces (transaction ST22) for any additional error messages that may provide more context.
  You can also enable RFC tracing in SM59 to capture detailed logs for troubleshooting.
  
  
  
  Related Information:
  
  SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  Documentation: Review the official SAP documentation for RFC connections and troubleshooting guidelines.
  Community Forums: Consider searching or posting on SAP community forums for insights from other users who may have encountered similar issues.
  
  By following these steps, you should be able to identify and resolve the cause of the /SMB/CM_API_COMMON257 Wrong RFC Connection error.