How To Fix APPL_PROC_HUB_PR020 - Could not connect to the back-end system &1

APPL_PROC_HUB_PR020 - Overview

• Message type: E = Error

• Message class: APPL_PROC_HUB_PR - Message Class for Purchase Requisition Extraction

• Message number: 020

• Message text: Could not connect to the back-end system &1

What causes this issue?

Could not connect to the back-end system <(>&<)>1. The attempt to
restart the job has failed twice.

System Response

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

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message APPL_PROC_HUB_PR020 - Could not connect to the back-end system &1 ?

  The SAP error message APPL_PROC_HUB_PR020 indicates that there is a problem with connecting to the back-end system specified in the error message. This can occur in various scenarios, such as when using SAP Process Integration (PI), SAP Process Orchestration (PO), or when trying to access a back-end system from a front-end application.
  Causes:
  
  Network Issues: There may be network connectivity problems between the front-end and back-end systems.
  Configuration Errors: Incorrect configuration settings in the SAP system or in the middleware (like PI/PO) can lead to connection failures.
  Service Unavailability: The back-end system may be down or not reachable due to maintenance or other issues.
  Authentication Problems: Issues with user credentials or authorization can prevent successful connections.
  Firewall Restrictions: Firewalls or security settings may be blocking the connection to the back-end system.
  Incorrect System Alias: The system alias used to connect to the back-end may be incorrect or not properly defined.
  
  Solutions:
  
  Check Network Connectivity: Ensure that the network connection