FTP ETW Tracing and IIS 8
In the past I have written a couple of blogs about using the FTP service's Event Tracing for Windows (ETW) features to troubleshoot issues; see FTP and ETW Tracing and Troubleshooting Custom FTP Providers with ETW for details. Those blog posts contain batch files which use the built-in Windows LogMan utility to capture an ETW trace, and they use downloadable LogParser utility to parse the results into human-readable form. I use the batch files from those blogs quite often, and I tend to use them a lot when I am developing custom FTP providers which add new functionality to my FTP servers.
Unfortunately, sometime around the release of Windows 8 and Windows Server 2012 I discovered that the ETW format had changed, and the current version of LogParser (version 2.2) cannot read the new ETW files. When you try to use the batch files from my blog with IIS 8, you see the following errors:
Verifying that LogParser.exe is in the path... Done. Starting the ETW session for full FTP tracing... The command completed successfully. Now reproduce your problem. After you have reproduced your issue, hit any key to close the FTP tracing session. Your trace events will be displayed automatically. Closing the ETW session for full FTP tracing... The command completed successfully. Parsing the results - this may take a long time depending on the size of the trace... Task aborted. <br>Cannot open <from-entity>: Trace file "C:\temp\ftp.etl" has been created on a OS version (6.3) that is not compatible with the current OS version Statistics: ----------- Elements processed: 0 Elements output: 0 Execution time: 0.06 seconds
I meant to research a workaround at the time, but one thing led to another and I simply forgot about doing so. But I needed to use ETW the other day when I was developing something, so that seemed like a good time to quit slacking and come up with an answer. :-)
With that in mind, I came up with a very easy workaround, which I will present here. Once again, this batch file has a requirement on LogParser being installed on your system, but for the sake of brevity I have removed the lines from this version of the batch file which check for LogParser. (You can copy those lines from my previous blog posts if you want that functionality restored.)
Here's the way that this workaround is implemented: instead of creating an ETW log and then parsing it directly with LogParser, this new batch file invokes the built-in Windows TraceRpt command to parse the ETW file and save the results as a CSV file, which is then read by LogParser to view the results in a datagrid like the batch files in my previous blogs:
@echo off rem ====================================================================== rem Clean up old log files for %%a in (ETL CSV) do if exist "%~n0.%%a" del "%~n0.%%a" echo Starting the ETW session for full FTP tracing... LogMan.exe start "%~n0" -p "IIS: Ftp Server" 255 5 -ets echo. echo Now reproduce your problem. echo. echo After you have reproduced your issue, hit any key to close the FTP echo tracing session. Your trace events will be displayed automatically. echo. pause>nul rem ====================================================================== echo. echo Closing the ETW session for full FTP tracing... LogMan.exe stop "%~n0" -ets rem ====================================================================== echo. echo Parsing the results - this may take a long time depending on the size of the trace... if exist "%~n0.etl" ( TraceRpt.exe "%~n0.etl" -o "%~n0.csv" -of CSV LogParser.exe "SELECT [Clock-Time], [Event Name], Type, [User Data] FROM '%~n0.csv'" -i:csv -e 2 -o:DATAGRID -rtp 20 )
Here's another great thing about this new batch file - it will also work down-level on Windows 7 and Windows Server 2008; so if you have been using my previous batch files with IIS 7 - you can simply replace your old batch file with this new version. You will see a few differences between the results from my old batch files and this new version, namely that I included a couple of extra columns that I like to use for troubleshooting.
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There is one last thing which I would like to mention in closing: I realize that it would be much easier on everyone if Microsoft simply released a new version of LogParser which works with the new ETW format, but unfortunately there are no plans at the moment to release a new version of LogParser. And trust me - I'm just as depressed about that fact as anyone else. :-(