How To Fix SB124 - No connection to target system/error in communication

SB124 - Overview

• Message type: E = Error

• Message class: SB - Version Management Messages

• Message number: 124

• Message text: No connection to target system/error in communication

What causes this issue?

A function module could not be executed in another SAP system, since
there was no physical connection to the target system, or communication
with the target system is faulty.

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?

Inform your system administrator.

Error message extract from SAP system. Copyright SAP SE.

SB124 - Details

• The SAP error message SB124, which indicates "No connection to target system/error in communication," typically arises when there is a failure in establishing a connection between the SAP system and a target system (such as another SAP system, a database, or an external application). This error can occur in various scenarios, such as during remote function calls (RFC), data transfers, or when accessing external services.
  Causes of SB124 Error
  
  
  Network Issues: Problems with the network connection, such as firewalls blocking the connection, network outages, or incorrect network configurations.
  
  
  Configuration Errors: Incorrect settings in the RFC destination configuration (transaction SM59), such as wrong hostnames, ports, or connection types.
  
  
  Target System Down: The target system may be down or not reachable due to maintenance or unexpected outages.
  
  
  Authorization Issues: The user credentials used for the connection may not have the necessary authorizations to access the target system.
  
  
  SAP Gateway Issues: Problems with the SAP Gateway service, which is