How To Fix CNV_IUUC_REPLICATION328 - Error while establishing RFC connection to the source system

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 328

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

An error occurred while trying to establish the RFC connection to the
source 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 source system.
The user has expired.
The source 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_REPLICATION328 - Error while establishing RFC connection to the source system ?

  The SAP error message CNV_IUUC_REPLICATION328 indicates that there is an issue with establishing an RFC (Remote Function Call) connection to the source system during data replication processes, often related to SAP Landscape Transformation (SLT) or data migration scenarios.
  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 target system (e.g., missing or incorrect parameters).
  Authorization Issues: The user credentials used for the RFC connection may not have the necessary authorizations to access the source system.
  System Availability: The source system may be down or not reachable due to maintenance or other issues.
  Firewall Restrictions: Firewalls or security settings may be blocking the connection between the systems.
  Incorrect Source System Details: The source system details (like hostname, system number, client, etc.) may be incorrectly specified in the RFC destination.
  
  Solutions:
  
  Check Network Connectivity: Ensure that the network connection between the source and target systems is stable and operational. You can use tools like ping or telnet to test connectivity.
  Verify RFC Destination:
  
  Go to transaction SM59 in the target system.
  Check the configuration of the RFC destination pointing to the source system.
  Ensure that the connection type is correct (usually TCP/IP).
  Test the connection using the "Test Connection" button.
  
  
  Review User Authorizations: Ensure that the user credentials used for the RFC connection have the necessary authorizations in the source system. You may need to check roles and profiles assigned to the user.
  Check Source System Status: Verify that the source system is up and running. You can log into the source system to confirm its availability.
  Firewall and Security Settings: If applicable, check firewall settings to ensure that the required ports for RFC communication are open.
  Correct Source System Details: Double-check the details in the RFC destination configuration to ensure they are accurate (hostname, system number, client, etc.).
  
  Related Information:
  
  Transaction Codes: 
  
  SM59: For managing RFC destinations.
  SM21: For checking system logs for any related errors.
  ST22: For analyzing dumps that may provide more context on the error.
  
  
  SAP Notes: Check for any relevant SAP Notes that may address specific issues related to this error message. You can search the SAP Support Portal for notes related to CNV_IUUC_REPLICATION328.
  Documentation: Review the documentation for SLT or the specific data replication tool you are using for any additional configuration steps or troubleshooting tips.
  
  If the issue persists after following these steps, consider reaching out to SAP support for further assistance, providing them with detailed logs and error messages for better diagnosis.