How To Fix CNV_IUUC_REPLICATION329 - Error while establishing RFC connection to the target system

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_IUUC_REPLICATION - IUUC replication messages (HANA)

• Message number: 329

• Message text: Error while establishing RFC connection to the target system

An error occurred while trying to establish the RFC connection to the
target system. Possible reasons for this include:
The RFC destination does not exist.
The user name or password is incorrect.
The user is locked in the target system.
The user has expired.
The target system is not responding, or is down.
An invalid host name was entered .

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

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_IUUC_REPLICATION329 - Error while establishing RFC connection to the target system ?

  The SAP error message CNV_IUUC_REPLICATION329 typically indicates an issue with establishing a Remote Function Call (RFC) connection to the target system during data replication processes, often related to the SAP Landscape Transformation (SLT) replication setup. Here are the potential causes, solutions, and related information for this error:
  Causes:
  
  Network Issues: There may be network connectivity problems between the source and target systems.
  RFC Destination Configuration: The RFC destination may not be correctly configured in the source system.
  Authorization Issues: The user credentials used for the RFC connection may lack the necessary authorizations.
  Target System Availability: The target system may be down or not reachable.
  Incorrect Parameters: The parameters used in the RFC connection might be incorrect or incomplete.
  Firewall Restrictions: Firewalls or security settings may be blocking the connection.
  
  Solutions:
  
  
  Check Network Connectivity:
  
  Use tools like ping or traceroute to verify that the source system can reach the target system.
  Ensure that there are no network outages or issues.
  
  
  
  Verify RFC Destination:
  
  Go to transaction SM59 in the source system and check the configuration of the RFC destination pointing to the target system.
  Test the connection from SM59 to ensure it is working correctly.
  
  
  
  Check User Authorizations:
  
  Ensure that the user specified in the RFC destination has the necessary authorizations to perform the required operations in the target system.
  Check roles and profiles assigned to the user.
  
  
  
  Check Target System Status:
  
  Ensure that the target system is up and running and that the relevant services are active.
  Check for any system logs or alerts that might indicate issues.
  
  
  
  Review RFC Parameters:
  
  Ensure that all required parameters in the RFC destination are correctly set, including the system ID, client, user, password, and language.
  
  
  
  Firewall and Security Settings:
  
  Check if there are any firewall rules or security settings that might be blocking the RFC connection.
  Ensure that the necessary ports are open for communication between the systems.
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  SM59: To manage and test RFC destinations.
  SLG1: To check application logs for more detailed error messages.
  ST22: To check for dumps that might provide additional context.
  
  
  
  Documentation: Refer to SAP Notes and documentation related to SLT and RFC connections for more detailed troubleshooting steps.
  
  
  SAP Support: If the issue persists after checking the above points, consider reaching out to SAP Support with detailed logs and error messages for further assistance.
  
  
  By following these steps, you should be able to diagnose and resolve the CNV_IUUC_REPLICATION329 error effectively.