How To Fix PN861 - Fatal RFC error. Program terminated. &1 &4

PN861 - Overview

• Message type: E = Error

• Message class: PN -

• Message number: 861

• Message text: Fatal RFC error. Program terminated. &1 &4

What causes this issue?

The RFC link could not be established.

System Response

The system could not establish a connection via the specified RFC link.

How to fix this error?

Please check the spelling of the RFC link, and make sure that it is
available in the system.

Error message extract from SAP system. Copyright SAP SE.

PN861 - Details

• The SAP error message "PN861 Fatal RFC error. Program terminated. &1 &4" typically indicates a problem with Remote Function Call (RFC) communication between SAP systems or between an SAP system and an external system. This error can occur due to various reasons, including network issues, configuration problems, or issues with the RFC destination.
  Causes:
  
  Network Issues: Problems with the network connection between the SAP systems can lead to RFC errors.
  RFC Destination Configuration: Incorrect configuration of the RFC destination in transaction SM59 can cause communication failures.
  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.
  Resource Limitations: The SAP system may be running out of resources (e.g., memory, processes).
  Version Compatibility: Incompatibility between different SAP versions or components can lead to RFC errors.
  
  Solutions:
  
  Check Network Connectivity: Ensure that there is proper network connectivity between the systems involved. You can use