How To Fix CB255 - Error during communication with RFC destination &

SAP Error Message - Details

• Message type: E = Error

• Message class: CB - PP-PI-PMA: Dialog Messages for Process Management

• Message number: 255

• Message text: Error during communication with RFC destination &

What causes this issue?

An error occurred during communication with the RFC destination &V1&.

System Response

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

How to fix this error?

INCLUDE 'NA_SYSVERW' OBJECT DOKU ID TX LANGUAGE E

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CB255 - Error during communication with RFC destination & ?

  The SAP error message CB255 indicates that there is an issue with communication to a Remote Function Call (RFC) destination. This error can occur for various reasons, and understanding the cause is essential for troubleshooting. Here are some common causes, potential solutions, and related information:
  Causes of CB255 Error
  
  
  Incorrect RFC Destination Configuration: The RFC destination may not be configured correctly in the SAP system. This includes incorrect connection parameters, such as the target system's IP address, port, or system ID.
  
  
  Network Issues: There may be network connectivity issues between the SAP system and the target system. This could be due to firewalls, routing problems, or network outages.
  
  
  Authorization Issues: The user credentials used for the RFC connection may not have the necessary authorizations to access the target system.
  
  
  Target System Down: The target system may be down or not reachable, which would prevent successful communication.
  
  
  SAP Gateway Issues: The SAP Gateway service may not be running or may be misconfigured, leading to communication failures.
  
  
  Version Compatibility: There may be compatibility issues between the SAP systems involved, especially if they are running different versions.
  
  
  Solutions
  
  
  Check RFC Destination Configuration:
  
  Go to transaction SM59 in the SAP GUI.
  Locate the RFC destination that is causing the error.
  Verify the connection parameters (e.g., target host, system number, client, user, password).
  Test the connection using the "Connection Test" button.
  
  
  
  Network Troubleshooting:
  
  Check network connectivity using tools like ping or traceroute to ensure that the target system is reachable.
  Verify firewall settings to ensure that the necessary ports are open for RFC communication.
  
  
  
  Review User Authorizations:
  
  Ensure that the user credentials used for the RFC connection have the necessary authorizations in both the source and target systems.
  
  
  
  Check Target System Status:
  
  Verify that the target SAP system is up and running. You can check this by logging into the target system or using monitoring tools.
  
  
  
  SAP Gateway Configuration:
  
  Ensure that the SAP Gateway service is running on both the source and target systems. You can check this using transaction SMGW.
  
  
  
  Check for Version Compatibility:
  
  Ensure that both SAP systems are compatible in terms of versions and patches. Consult SAP notes or documentation for any known issues.
  
  
  
  Related Information
  
  
  Transaction Codes:
  
  SM59: Manage RFC Destinations
  SMGW: Monitor SAP Gateway
  ST22: Dump Analysis (to check for any ABAP runtime errors)
  SICF: Check HTTP services if using HTTP RFC
  
  
  
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that may address specific issues related to RFC communication.
  
  
  Logs: Check the system logs (transaction SM21) for any additional error messages or warnings that may provide more context about the issue.
  
  
  By following these steps, you should be able to identify and resolve the cause of the CB255 error in your SAP system. If the issue persists, consider reaching out to SAP support for further assistance.