How To Fix CNV_IUUC_REPL_TS023 - RFC communication error for RFC connection &1 (error message: &2)

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_IUUC_REPL_TS - Messages for troubleshooting functions

• Message number: 023

• Message text: RFC communication error for RFC connection &1 (error message: &2)

What causes this issue?

The remote function call (RFC) connection to destination &V1& failed.

System Response

The replication cannot proceed without a valid, working, RFC connection.
The interface layer returned "&V2&" to the SAP application.

How to fix this error?

Check the RFC connection &V1& in the <DS:TRAN.SM59>RFC Overview</>.

Procedure for System Administrators

Communication failure in RFC to &V1&; text = &V2&.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_IUUC_REPL_TS023 - RFC communication error for RFC connection &1 (error message: &2) ?

  The SAP error message CNV_IUUC_REPL_TS023 indicates an RFC (Remote Function Call) communication error related to a specific RFC connection. This error typically arises during data replication processes, particularly in the context of SAP Landscape Transformation (SLT) or other data replication scenarios.
  Cause:
  
  Network Issues: There may be network connectivity problems between the source and target systems.
  RFC Configuration: The RFC destination may not be correctly configured or may be inactive.
  Authorization Issues: The user credentials used for the RFC connection may not have the necessary authorizations.
  System Availability: The target system may be down or not reachable.
  Timeouts: The RFC call may be timing out due to long processing times or heavy load on the system.
  Version Mismatch: There may be compatibility issues between the systems involved, especially if they are running different versions of SAP.
  
  Solution:
  
  Check Network Connectivity: Ensure that there is proper network connectivity between the systems. You can use tools like ping or traceroute to diagnose network issues.
  Verify RFC Configuration:
  
  Go to transaction SM59 in the SAP GUI.
  Check the configuration of the RFC destination mentioned in the error message.
  Test the connection using the "Connection Test" option.
  
  
  Check User Authorizations: Ensure that the user credentials used for the RFC connection have the necessary authorizations to perform the required operations.
  System Status: Verify that the target system is up and running. You can check the system status in transaction SM51 or SM66.
  Increase Timeout Settings: If timeouts are an issue, consider increasing the timeout settings for the RFC connection in SM59.
  Review Logs: Check the system logs (transaction SM21) and the application logs (transaction SLG1) for any additional error messages that may provide more context.
  Consult SAP Notes: Look for relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  
  Related Information:
  
  RFC Connection Types: Understand the different types of RFC connections (e.g., T, TCP/IP, etc.) and ensure the correct type is being used.
  SLT Configuration: If this error occurs in the context of SLT, review the SLT configuration and ensure that all settings are correct.
  SAP Support: If the issue persists after following 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 diagnose and resolve the CNV_IUUC_REPL_TS023 RFC communication error.