How To Fix APPLG409 - MUX: Slave proxy already exists in the synchronization job

APPLG409 - Overview

• Message type: E = Error

• Message class: APPLG - Application Graphics Messages (Graphic Proxy Framework)

• Message number: 409

• Message text: MUX: Slave proxy already exists in the synchronization job

What causes this issue?

A slave proxy is to be assigned to a synchronization job that
already exists.

System Response

The assignment is ignored. The other slave proxies are added to the
synchronization job.

How to fix this error?

Check the call method of the multiplexer.

Error message extract from SAP system. Copyright SAP SE.

APPLG409 - Details

• The SAP error message APPLG409 with the description "MUX: Slave proxy already exists in the synchronization job" typically occurs in the context of SAP Landscape Management (LaMa) or when dealing with system replication and synchronization jobs. This error indicates that there is an attempt to add a slave proxy to a synchronization job, but a proxy with the same identifier already exists.
  
  Cause:
  
  Duplicate Configuration: The error is often caused by a configuration issue where a slave proxy has already been defined in the synchronization job.
  Job Misconfiguration: There may be a misconfiguration in the synchronization job settings, leading to the system trying to add a duplicate entry.
  System State: The system might be in a state where it has not properly released resources or cleaned up previous configurations, leading to conflicts.
  
  
  Solution:
  
  Check Existing Proxies: Review the synchronization job configuration to see if the slave proxy already exists. You can do this through the SAP