How To Fix XS109 - Waiting for aRFC: Maximum wait time of &1 exceeded

XS109 - Overview

• Message type: E = Error

• Message class: XS - SAPconnect: All messages

• Message number: 109

• Message text: Waiting for aRFC: Maximum wait time of &1 exceeded

What causes this issue?

If the send process is running in parallel mode, the send dispatcher
calls the actual send processes by means of asynchronous RFC. The send
processes are therefore processed in the variou work processes of the
servers that are specified in the RFC server group. After all the send
requests have been distributed, the dispatcher waits until all the
asynchronous RFC calls have reported back. However, if any send
processes need longer than a specified time, the send dispatcher cancels
the whole run for the current address type since a temporary disruption
cannot be ruled out.

System Response

The maximum wait time of &V1& was exceeded.

How to fix this error?

The wait time after which the send dispatcher cancels depends on the
maximum number of send requests (package size) that were transferred to
one of the work processes simultaneously, and on a factor that can be
set on the user interface in the SAPconnect administration. If this
error persists, increase this factor.

Procedure for System Administrators

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.

XS109 - Details

• The SAP error message XS109, which states "Waiting for aRFC: Maximum wait time of &1 exceeded," typically occurs in the context of asynchronous Remote Function Calls (aRFC) in SAP systems. This error indicates that a request has been waiting for a response longer than the configured maximum wait time.
  
  Cause:
  
  Long Processing Time: The function module being called via aRFC is taking too long to process, which can be due to various reasons such as heavy load, inefficient code, or resource contention.
  System Performance Issues: High CPU or memory usage on the application server can lead to delays in processing aRFC calls.
  Deadlocks or Lock Contention: If the function module is trying to access locked resources, it may lead to delays.
  Network Issues: Problems in the network can also cause delays in communication between systems.
  
  Configuration Issues: The maximum wait time for aRFC calls may be set too low for the expected processing time.
  
  
  Solution:
  
  Increase Maximum Wait