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ExMon Error – UnKnown StartTrace error (183)

ExMon : ExMon (Microsoft Exchange User Monitor) is a tool to Identify and Troubleshoot issues on Exchange Server (2003, 2007, 2010, 2013 & 2016).

Using ExMon tool, Administrator can view the following:

1: User Activity
2: Mailbox Access
Incoming requests in isolating the possible causes in the real-time scenarios and for better understanding of User current usage pattern.

3: IP Addresses used by clients
4: Microsoft Office Outlook Versions and mode, such as cached Exchange Mode and Classic online Mode
5: Outlook client-side monitoring data

Resource usage like:

a: CPU Usage
b: Server-side processor latency
Total latency for network and processing with Outlook 2003 and later versions of MAPI
c: Network bytes

Download the ExMon for Exchange 2013 & 2016 https://www.microsoft.com/en-us/download/details.aspx?id=51101


Installing ExMon Tool :

1: Click the Download button on this page to start the download

Do one of the following:
To start the installation immediately, click Run.
To save the download to your computer for installation at a later time, click Save.
To cancel the installation, click Cancel.
To install Microsoft Exchange Server User Monitor, please make sure you follow the instructions provided in file ‘Using_ExMon.doc’ which is in the self-extracting package.


After Installing while running we are getting error : UnKnown StartTrace error (183)



This error is because there is an Old Event Trace is still running in the background. There you need to stop this old trace using the tool called Tracelog.exe in the older versions of Windows Servers like (win 2000 & 2003).

But in Windows Server 2008 & above you can stop the old Event Trace using toll called Logman.exe



If it is in Running Status then stop the Exmon trace using the command:

Command : logman Stop “Exchange Event Trace” -ets



Alternate Step:


If this this doesn’t work using command line then you can stop it in server Manager.

As we are aware that whenever you run ExMon tool this creates its own session:

Server Manager -> Diagnostics -> Performance -> Data Collector Sets -> Event Trace Sessions -> Exchange Event Trace


After stopping the “Exchange Event Trace” this time you should able to run the ExMon without any issues.

Still the issue then check the disk space not running out of space, else reboot the server and check.



Praveen Kumar

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