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

SAP Error Message - Details

• 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.

Smart SAP Assistant

• What is the cause and solution for SAP error message XS109 - Waiting for aRFC: Maximum wait time of &1 exceeded ?

  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 Time: You can increase the maximum wait time for aRFC calls in the system settings. This can be done by adjusting the parameter rdisp/max_wait_time in the instance profile.
  Optimize Function Module: Review and optimize the function module being called to ensure it runs efficiently. Look for any performance bottlenecks.
  Monitor System Performance: Use transaction codes like ST03N, ST06, or SM50 to monitor system performance and identify any resource bottlenecks.
  Check for Locks: Use transaction SM12 to check for any locks that might be causing contention and resolve them if necessary.
  Network Diagnostics: If you suspect network issues, perform network diagnostics to ensure that there are no connectivity problems between the systems involved.
  Review Background Jobs: If the function module is being called from a background job, check the job logs for any errors or long-running processes that might be affecting performance.
  
  Related Information:
  
  Transaction Codes: 
  
  SM58: Monitor aRFC calls and check for any failed or stuck calls.
  SM21: Check the system log for any related error messages.
  ST22: Analyze short dumps that may provide insights into the issue.
  
  
  SAP Notes: Check SAP Notes related to aRFC and performance issues for any specific recommendations or patches.
  Documentation: Review SAP documentation on aRFC and performance tuning for best practices.
  
  By addressing the underlying causes and implementing the suggested solutions, you should be able to resolve the XS109 error and improve the performance of your aRFC calls.