How to log RPC Client Access Throttling in Exchange 2010?
By default, no RPC Client Access throttling is logged. The common way is to use Perfmon counters to see when throttling occurs. But there is an easier way to log the throttling activity within Exchange. This tip was presented by Scott Schnoll in TechEd 2012.
The logging is enabled by modifying the Microsoft.Exchange.RpcClientAccess.Service.Exe.Config file in the Bin directory.
Open the config file using notepad and add “Throttling” as a value to the last <add key> line.
The last line should be as shown below, after the change.
Once the change has been made, save the file and restart the RPC Client Access Service. If you have more than one CAS server, make the same change on all of them. Job done!