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

CNV_IUUC_REPLICATION328 - Overview

• 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.

CNV_IUUC_REPLICATION328 - Details

• 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