Channel 9 - Entries tagged with Troubleshooting

Defrag Tools: #41 - WPT - Command Line

Larry Larsen, Andrew Richards, Chad Beeder — Mon, 20 May 2013 14:24:52 GMT

In this episode of Defrag Tools, Andrew Richards, Chad Beeder and Larry Larsen continue walking you through the Windows Performance Toolkit (WPT).

Resources:
Defrag Tools: #23 - Windows 8 SDK
Defrag Tools: #29 - WinDbg - ETW Logging
Windows Performance Analysis Developer Center
Windows Performance Toolkit
Channel 9 Videos
NTDebugging Blog Article
PFE Blog Series

Timeline:
[00:00] - UI vs. Command Line
[02:15] - wpr.exe -profiles
[02:48] - wpr.exe -profiledetails
[05:30] - wpr.exe -start
[06:06] - wpr.exe -stop result.etl
[09:25] - xperf.exe -help
[09:30] - xperf.exe -providers kg
[12:18] - xperf.exe -providers kf
[16:47] - xperf.exe -on
[18:17] - xperf.exe -stop -d result.etl
[21:42] - xperf.exe ... -BufferSize
[25:55] - xperf.exe ... -MinBuffers -MaxBuffers
[27:08] - xperf.exe ... -MaxFile
[27:44] - xperf.exe ... -FileMode Circular
[30:42] - xperf.exe -merge
[32:28] - Andrew's Scripts on SkyDrive [link]
[33:15] - xperf.exe -help stackwalk
[35:10] - xperf.exe ... -stackwalk

Examples:
wpr.exe -start GeneralProfile
pause
wpr.exe -stop result.etl

xperf.exe -on Base -stackwalk Profile -BufferSize 1024 -MinBuffers 256 -MaxBuffes 256 -MaxFile 256 -FileMode Circular
pause
xperf.exe -stop -d result.etl

Defrag Tools: #40 - WPT - WPR & WPA

Larry Larsen, Andrew Richards, Chad Beeder — Mon, 13 May 2013 15:20:42 GMT

In this episode of Defrag Tools, Andrew Richards, Chad Beeder and Larry Larsen continue walking you through the Windows Performance Toolkit (WPT).

Timeline:
[00:40] - Windows Performance Recorder (UI)
[06:00] - Windows Performance Analyzer
[06:40] - Providers vs. Visualization
[08:00] - (CPU Usage) Sampled vs. Precise
[12:30] - Analysis Pane
[14:11] - * I was thinking of MDI (Multiple Document Interface]
[14:35] - Blue Bar
[15:27] - Gold/Yellow Bar - How to Aggregate
[19:18] - Symbols & SymCache
[28:40] - Column Customization
[31:50] - More next week... and many more weeks to come!

Defrag Tools: #39 - Windows Performance Toolkit

Larry Larsen, Andrew Richards, Chad Beeder — Mon, 06 May 2013 18:00:45 GMT

In this episode of Defrag Tools, Andrew Richards, Chad Beeder and Larry Larsen starting walking you through the Windows Performance Toolkit (WPT).

Timeline:
[00:00] - What is the Windows Performance Toolkit (WPT)?
[06:23] - Articles
[10:33] - Architecture of Event Tracing for Windows (ETW)
[18:30] - Windows Performance Recorder
[21:50] - Default, Resource and Scenario Profiles
[29:07] - More next week... and many more weeks to come!

Defrag Tools: #38 - JavaScript - Part 2

Larry Larsen, Andrew Richards, AmandaS — Mon, 29 Apr 2013 17:14:22 GMT

In this episode of Defrag Tools, Andrew Richards, Amanda Silver and Larry Larsen continue walking you through the debugging of JavaScript Windows Store applications with Visual Studio. Amanda is a Principal developer for the JavaScript engine used in Internet Explorer, Windows Store applications and Visual Studio.

Timeline:
[01:25] - "Image Tile" bug
[05:00] - Interop Debugging
[06:20] - Debugger Type: Script Only vs. Native/Mixed
[08:17] - JavaScript deployment internals
[11:53] - Attach...
[14:10] - Memory Profiling
[16:58] - JavaScript Memory Analysis (VS2012 Update 1)
[20:18] - Snapshot details
[21:25] - "Root" View

Defrag Tools: #37 - JavaScript - Part 1

Larry Larsen, Andrew Richards, AmandaS — Mon, 22 Apr 2013 17:52:48 GMT

In this episode of Defrag Tools, Andrew Richards, Amanda Silver and Larry Larsen start walking you through the debugging of JavaScript Windows Store applications with Visual Studio. Amanda is a Principal developer for the JavaScript engine used in Internet Explorer, Windows Store applications and Visual Studio.

Timeline:
[00:54] - Debugging a JavaScript Windows Store application
[02:30] - Catching Crashes (unhandled exceptions)
[04:25] - WinJS.Utilities.startLog
[05:22] - app.onerror
[09:30] - Stacks
[11:47] - e.detail.error.stack
[14:23] - use strict
[20:25] - www.jslint.com integrated in VS
[22:13] - "Pin" bug
[24:58] - tile vs. title - Lint cannot detect this
[26:50] - Next time... more JavaScript debugging!

Defrag Tools: #36 - CLR GC - Part 4

Larry Larsen, Andrew Richards — Mon, 15 Apr 2013 17:24:05 GMT

In this episode of Defrag Tools, Andrew Richards, Maoni Stephens and Larry Larsen continue walking you through the CLR Garbage Collector - specifically PerfView. Maoni is the Principal developer for the GC on the CLR team.

Resources:
Maoni's WebLog
PerfView (Download)
Channel 9 - PerfView Tutorial - by Vance Morrison

Timeline:
[00:38] - PerfView overview
[02:52] - (Basic) Collection
[04:39] - GCStats
[10:10] - GC Rollup By Generation
[11:22] - GC Events By Time (>200ms)
[11:31] - LOH Allocation (>200ms)
[12:34] - Gen2
[12:48] - GC Events By Time
[28:40] - Best Approach to Performance Analysis
[31:03] - GC Collect Only
[32:10] - Channel 9 - PerfView Tutorial

Defrag Tools: #35 - CLR GC - Part 3

Larry Larsen, Andrew Richards — Mon, 08 Apr 2013 18:49:26 GMT

In this episode of Defrag Tools, Andrew Richards, Maoni Stephens and Larry Larsen continue walking you through the CLR Garbage Collector. Maoni is the Principal developer for the GC on the CLR team.

Resources:
Maoni's WebLog
Channel9 - CLR 4 Garbage Collector - Inside Background GC
Channel9 - CLR 4.5: Maoni Stephens - Server Background GC
MSDN Magazine - Investigating Memory Issues

Timeline:
[00:45] - Internal and Externals Roots
[05:55] - Start of GC: clr!WKS::GCHeap::GarbageCollectGeneration
[07:00] - !sos.dumpheap (Range)
[07:30] - !sos.gcroot (or !sos.gcwhere )
[09:45] - New Root Types? Dependent Handles (ConditionalWeakTable)
[12:32] - Handle Types
[13:30] - Pinned Handles - Effect on Fragmentation
[15:40] - Large Object Heap's Fragmentation & Coalescence
[17:55] - Pinned Objects
[19:33] - !sos.gchandles
[20:06] - !sos.gchandles -type Pinned
[20:45] - !sos.gchandles -type AsyncPinned

Defrag Tools: #34 - CLR GC - Part 2

Larry Larsen, Andrew Richards — Tue, 02 Apr 2013 14:46:00 GMT

Resources:
Maoni's WebLog
Channel9 - CLR 4 Garbage Collector - Inside Background GC
Channel9 - CLR 4.5: Maoni Stephens - Server Background GC
MSDN Magazine - Investigating Memory Issues

Timeline:
[03:30] - How to approach Performance Analysis
[09:00] - Cadence of Gen 0, 1 and 2 garbage collection
[12:20] - !sos.FindRoots
[14:00] - Stop at Gen 1 GC - !sos.FindRoots -gen 1
[16:09] - End of GC: clr!WKS::GCHeap::RestartEE
[17:10] - Stacks of allocations [CLRProfiler] [PerfView]
[18:39] - Object's Generation - !sos.gcwhere
[19:28] - Generation Segments - !sos.eeheap -gc
[24:52] - VM Hoarding
[28:24] - Heap Summary - !sos.heapstat

Defrag Tools: #33 - CLR GC - Part 1

Larry Larsen, Andrew Richards — Mon, 25 Mar 2013 22:07:58 GMT

In this episode of Defrag Tools, Andrew Richards, Maoni Stephens and Larry Larsen walk you through the CLR Garbage Collector. Maoni is the Principal developer for the GC on the CLR team.

Resources:
Maoni's WebLog
Channel9 - CLR 4 Garbage Collector - Inside Background GC
Channel9 - CLR 4.5: Maoni Stephens - Server Background GC
MSDN Magazine - Investigating Memory Issues

Timeline:
[00:00] - What is a Garbage Collector (GC)?
[02:40] - How has the GC changed?
[06:02] - Memory issues
[08:57] - Stress Log (!sos.dumplog)
[10:08] - Troubleshooting and Performance
[12:20] - Demo App
[14:20] - !sos.eeheap -gc
[18:08] - !sos.dumpheap -stat
[20:38] - !sos.dumpheap -mt (Method Table)
[21:58] - !sos.dumpobj / !sos.do (Dump Object)
[24:15] - Performance Monitoring (SOS, PerfView, Performance Monitor)
[28:06] - Measure immediately after an action, not at a cadence
[29:45] - x clr!WKS::GCHeap::GcCondemnedGeneration (Current GC being collected)
[31:15] - bp clr!WKS::GCHeap::RestartEE (Break after a GC)
[35:30] - More next week...

Defrag Tools: #32 - Desktops

Larry Larsen, Andrew Richards, Chad Beeder — Mon, 18 Mar 2013 22:20:50 GMT

In this episode of Defrag Tools, Andrew Richards, Chad Beeder and Larry Larsen walk you through Sysinternals Desktops. Desktops allows you to organize your applications on up to four virtual desktops. We go under the covers and show how Desktops fits in to the Session, Window Station and Desktop object/security model.

** I didn't do a great job explaining Sessions/Window Stations/Desktops -- If you want to know about those concepts in detail, I suggest you watch Sysinternals Primer: Gems instead.

Resources:
Sysinternals Desktops
Sysinternals WinObj
Sysinternals LogonSessions
Aaron Margosis' TSSessions
Sysinternals Administrator's Reference - [Amazon]
Sysinternals Primer: Gems [TechEd EMEA 2012 @13:45]
Malware Hunting with the Sysinternals Tools [TechEd USA 2012 @ 44:30]

Timeline:
[01:05] - Sysinternals Desktops
[04:50] - Sessions, Window Stations and Desktops
[05:13] - Sysinternals WinObj
[05:43] - Sessions
[06:40] - Window Stations
[09:00] - Enumeration (Standard User)
[10:11] - Desktops
[11:38] - Local Security Authority (LSA) - Sessions via Logons *
[12:16] - Enumeration (Elevated User)
[15:20] - psexec -sid cmd.exe
[16:38] - Enumeration (NT Authority\SYSTEM)
[17:15] - Sessions via Logons (NT Authority\SYSTEM)
[18:26] - Media Center Extender example

* You can enumerate sessions directly via the Remote Desktop Services API.

Exercises:

Use Sysinternals LogonSessions to view the logon sessions.
Use Aaron Margosis' TSSessions to view the Sessions/Window Stations/Desktops (and much more).

Session: 0
WinStation: WinSta0
    Desktop: Default
    Desktop: Disconnect
    Desktop: Winlogon
WinStation: Service-0x0-3e4$
  WinStation: Service-0x0-3e5$
  WinStation: Service-0x0-3e7$
  WinStation: msswindowstation
     Desktop: mssrestricteddesk
Session: 1
WinStation: WinSta0
    Desktop: Default
    Desktop: Disconnect
    Desktop: Winlogon
...

Defrag Tools: #31 - ZoomIt

Larry Larsen, Andrew Richards, Chad Beeder — Mon, 11 Mar 2013 20:27:38 GMT

In this episode of Defrag Tools, Andrew Richards, Chad Beeder and Larry Larsen walk you through Sysinternals ZoomIt. ZoomIt is a screen zoom and annotation tool for technical presentations that include application demonstrations. ZoomIt runs unobtrusively in the tray and activates with customizable hotkeys to zoom in on an area of the screen, move around while zoomed, and draw on the zoomed image.

Resources:
Sysinternals ZoomIt
Sysinternals Administrator's Reference - [Amazon]

Timeline:
[00:00] - Overview
[01:42] - Windows Magnifier (Win-+)
[03:35] - Ctrl-1 - Static Zoom
[05:30] - Ctrl-2 - Draw
[06:38] - Ctrl-4 - Live Zoom
[08:12] - File Save *
[10:05] - Ctrl-3 - Break Timer

* Zoomed to 480x300 on a 1920x1200 screen, the file sizes are:

Zoomed - 1920x1200
Actual - 480x300

Defrag Tools: #16 - WinDbg - Driver Verifier

Larry Larsen, Andrew Richards, Chad Beeder — Mon, 26 Nov 2012 17:27:00 GMT

Not all Blue Screens of Death are easy to debug! Sometimes, you need to enable extra checking to help catch a buggy device driver. In this episode of Defrag Tools, Chad Beeder and Larry Larsen discuss using Driver Verifier in conjunction with WinDbg to track down a driver which is corrupting kernel mode pool memory.

Debugger commands used:

!analyze -v
.trap
ub
dp
dps
dc
kv

Make sure you watch Defrag Tools Episode #1 for instructions on how to get the Debugging Tools for Windows and how to set the required environment variables for symbols and source code resolution.

Resources:

Debugging Tools for Windows

Windows Internals book tools (including NotMyFault)

Forcing a System Crash from the Keyboard

How to generate a complete crash dump file or a kernel crash dump file by using an NMI on a Windows-based system

Driver Verifier Options

Timeline:

[00:09] - What is Driver Verifier?
[01:54] - Using NotMyFault to cause a buffer overflow
[06:04] - Looking at a buffer overflow dump in WinDbg
[08:10] - What is the .trap command? (see: x64 Register Usage)
[12:45] - First dump was inconclusive. Looking at a second buffer overflow dump.
[15:47] - Memory is corrupted, but how to find out who is corrupting it? Driver Verifier!
[16:55] - Launching and configuring Driver Verifier
[20:20] - Verifier enabled, let's crash the system!
[21:25] - What is special pool?
[22:27] - Looking at the memory dump (captured with Verifier enabled)
[25:13] - Forcing a memory dump of a hung system via keyboard
[28:00] - Forcing a memory dump of a hung system via NMI switch
[31:52] - Advanced/custom Driver Verifier settings

Defrag Tools: #15 - WinDbg - Bugchecks (BSOD)

Larry Larsen, Andrew Richards, Chad Beeder — Mon, 19 Nov 2012 08:58:11 GMT

In this episode of Defrag Tools, Chad Beeder and Larry Larsen discuss analyzing kernel mode bugchecks (colloquially known as Blue Screens of Death) using WinDbg from the Debugging Tools For Windows.

We use these commands:

!analyze -v
.hh
.trap
!pte
!process
!thread
.formats
.process
.thread
k
~
.reload

Resources:

Debugging Tools for Windows

How to generate a kernel or a complete memory dump file in Windows Server 2008 and Windows Server 2008 R2

Windows Internals book tools (including NotMyFault)

Timeline:

[00:50] - What is a bugcheck (blue screen)?
[03:23] - Different types of memory dump files (complete, kernel-only, mini)
[05:16] - Windows Error Reporting
[07:17] - Configuring your system for a memory dump
[07:54] - Enabling "Complete memory dump" option on Windows 7 and Server 2008 R2; see KB 969028
[10:45] - Looking at a 32-bit memory dump created by NotMyFault
[12:04] - Symbol path
[13:21] - Step 1 is always: !analyze -v
[15:40] - Looking up bug check descriptions - Windows Debugger Help (.hh)
[19:45] - Looking at the trap frame (.trap)
[20:18] - Why did a memory access fail? (Using !pte command to look at virtual memory mappings)
[22:15] - What is a trap frame? (64-bit systems do not store all registers in trap frames; see blog post here)
[26:50] - Showing all running processes with !process 0 0
[28:48] - View more details on a specific process with !process
[31:43] - Converting between numerical formats with .formats
[32:55] - Switching the debugger into a process or thread context: use .process or .thread
[35:10] - Switching between CPUs (~ command)
[38:13] - Next week: Driver Verifier

Defrag: TPM & Bitlocker, Search Service, How to Pick Wifi Hardware

Larry Larsen — Mon, 26 Sep 2011 17:16:24 GMT

Microsoft tech troubleshooter extraordinaire Gov Maharaj and I help walk you through troubleshooting solutions to your tech support problems. If you have a problem you want to send us, you can use the Problem Step Recorder in Windows 7 (see this for details on how) and send us the zip file to DefragShow@microsoft.com. We will also be checking comments for problems, but the email address will let us contact you if needed.

[00:15] Is there a way to start Windows Device Manager faster?
[02:39] I get error "Incompatible TPM device" when using Bitlocker.
[06:55] In on Morto worm and how it works. Are machines on home network with no password at risk?
[09:39] How exactly does Search Service work? Best practices for searching folders. [link]
[11:58] Can I move the User folder to a non-system partition? [link]
[14:15] What to look for when picking a WiFi card.
[17:45] What to look for when picking a WiFi router.
[19:24] How to run pinned icons as elevated?
[20:15] Is it possible to downgrade to another version of Windows?
[21:32] How to control media on a PC from distance. [link]
[25:52] Can I select which access point in a group my computer connects to?
[27:19] WiFi card in laptop appears to be working but can't see a network.
[29:50] Hearing noise from unused platter drive in SSD laptop. Cause?
[32:15] Adding apps to the Windows 7 Explorer Favorites List.

Defrag: SSD Questions, Tagging Files, Mirroring Drives, Hardware Hacks

Larry Larsen — Wed, 20 Jul 2011 21:23:33 GMT

00:20 Eric Meijer and Charles interview Gov Maharaj.
04:12 All About SSDs - How do you know TRIM is enabled?
07:00 Is there any benefit to a defrag on an SSD?
08:42 What's the fastest way to connect a SSD
09:44 Can I tag text files like I do pictures in Windows 7?
12:53 Monitor no longer wakes from sleep.
14:42 Can I mirror my C: drive to another drive as a backup while Windows is running?
18:32 Will a "low level format" fix a thumbdrive that has bad sectors?
22:21 Deleted Thumbs.db and Desktop.ini, now having problems.
27:12 Windows crashes non-responding app too soon, is there a way to make it wait longer?
30:30 Hacking hardware - our pick of the week is Sugru.

Defrag 001: Startup Slow Downs, Can't Boot, Blue Screens, Homegroup, IE Logins

Larry Larsen — Thu, 03 Mar 2011 20:20:48 GMT

Today I'm joined with Microsoft tech troubleshooter extraordinaire Gov Maharaj to help walk you through solutions to your tech support problems. In an effort to help solve future problems we're going to look at these issues beyond just fixing them and drill down into how Gov would actually troubleshoot these problems. In our next episode we'll be pulling tech support issues in part from the comments here. We're happy to take on problems with Windows, Office, WP7, or other Microsoft products, so if there are nagging issues you could use a hand with, let us know here.

In this episode of Defrag:
1:35 - Troubleshooting Windows 7 Start-up Slowdowns. (Sysinfo, Autoruns, Startup Delayer)
10:23 - Windows won't boot.
15:00 - Blue Screens (WinDBG)
26:12 - Troubleshooting Homegroup
28:48 - Problems logging in to sites with Internet Explorer.

Brian Peek's PDC Laptop Leak Fix

Larry Larsen — Thu, 04 Feb 2010 21:48:00 GMT

Brian Peek picked up a PDC Laptop on eBay and found that the latest accelerometer driver (v1.00.00.16) wasn't correctly closing handles, resulting in his machine having 5 million handles open. So he did what any self-respecting Niner would do, he disassembled the code and created a fix. If you happen to have a PDC Laptop, you can download the application and the source code here. Additionally, you can find more details and code samples on Brian's blog. Keep in mind the suggested way to obtain drivers is through Windows Update, so your mileage may vary, caveat emptor, etc.

Melur Raghuraman: Inside Windows 7 - Diagnostics and Troubleshooting

Charles — Thu, 03 Sep 2009 16:41:00 GMT

Windows Development Manager Melur Raghuraman and team have taken troubleshooting and diagnostics to a whole new level in Windows 7. For one thing, Windows 7 uses managed code "natively" as PowerShell has become the de facto language used for creating diagnostic algorithms that live inside of diagnostic packages. So, when something goes wrong eventually a PowerShell script runs and diagnosis happens.

You've probably already noticed the information flag that appears in your task bar notification area when Windows wants to tell you something important. Well, in order for Windows 7 to inform you of a problem and its solution it must first diagnose the issue and collect troubleshooting steps. Sometimes, and more so than ever before, Windows will simply fix the problem and let you know about it - this is a trend that will only become more common over time and with each iteration of Windows going forward. This troubleshooting fabric has both client and server (cloud) components.

How does this all work, exactly? What's the story?

Tune in. Lots to learn here. The new troubleshooting and diagnostics capabilities in Windows 7 marks a signficant step forward in the evolution of Windows supportability. Of course, you, the human user, can write your own diagnostic scripts - so you'll be more efficient when you need to diganosis and then fix some computer problem.

Michael Fortin: Windows 7 Efficiency

Charles — Wed, 22 Jul 2009 20:42:00 GMT

The Windows 7 project involved very efficient software engineering planning and execution. It is no surprise that an equivalent level of efficiency exists throughout the OS (efficiency in how the OS deals with faults, threads, memory management, power management, process management, window management, graphics, audio, local search, diagnostics, and on and on - truly excellent, and efficient, engineering).

Michael Fortin is a Distinguished Engineer in the Windows Core Operating System Division. His team builds the technologies that help make Windows 7 reliable, stable and performant, which are core ingredients in any highly efficient general purpose operating system. You'll hear us talk about Windows 7 as a very efficient general purpose operating system quite a bit over the coming months. In fact, if I had to sum up Windows 7 in one word it would be Efficient.

Michael's team also builds the troubleshooting and diagnostics systems in Windows, including the internal mechanisms that construct fault data packages and sends them to cloud-based components which receive data from millions of clients running Windows 7. Michael's team is a global team - engineers are located in multiple places around the world including a stellar team of engineers located in Beijing, China (you'll meet them in the future right here on C9).

You may remember Michael from his last interview on Channel 9 that covered his work on Vista's SuperFetch and ReadyBoost technologies. Yep, these great technologies are alive and well in Windows 7 and have evolved to meet the needs of the evolving system and help add to the overall efficiency of Windows. (There, I wrote "efficiency" again...)

Over the past year or so, Michael's team has received, analyzed and acted upon a very large amount of data sent from Windows 7 Beta and RC running on a variety of PCs with a variety of hardware and software configurations in place. This data was used to construct new system features, like the Fault Tolerant Heap, and to engineer updates to existing mechanisms to make them more robust or performant or reliable or stable... You will meet some of his team here on C9 in the future and we will dig into many of the mechanisms Michael touched on in this conversation (Fault Tolerant Heap, Troubleshooting and Diagnostics, etc).

Here, Michael and I chat about the work his team has done, the engineering philosophy that has driven efficiency into Windows at all levels (from the kernel to the shell), the knowledge his team has gained about how Windows is used in the wild, what the most common problems have been and the solutions that are based on this important telemetry data. So, for all of you out there who chose to send fault data from your PC to Microsoft - THANK YOU. You truly have helped, in a fundamental way, to make Windows 7 the most efficient general purpose operating system from Microsoft to date. Yeah. True story.

Enjoy.

New Microsoft Fix It Blog

Sarah Perez — Wed, 04 Feb 2009 17:55:00 GMT

Have you ever come across a Knowledge Base (KB) article or been presented with a Windows Error Reporting (WER) solution and asked yourself, “Why can’t Microsoft just fix this for me?” Today, KB articles and WER solutions provide lists of steps that can be followed to resolve your problem, but tomorrow could be different. That’s the promise being delivered by the new Microsoft Fix It Team – a group of engineers whose goal is to automate the steps in Microsoft’s KB articles and WER solutions so that you can click a button and have your issue resolved.

The blog, already in action, is updated with the KB articles that already have automated solutions available. For an example, see this one. You’ll notice when you scroll down to “Method 3” there’s an option to click the “Fix it” button which will automatically resolve the issue.

I have to admit, this pretty awesome. Seriously.

Troubleshoot Network Connections with Your Mobile Phone

Sarah Perez — Wed, 11 Jun 2008 12:17:00 GMT

From Enterprise Mobile, there comes an application for Windows Mobile users that allows you to troubleshoot network connections right from your Windows Mobile device. The app is called the Windows Mobile IP Utility and it lets you run the following commands: ping, trace route, ping sweep (ping a sequential range of IPs), speed test, and ipconfig. The utility will also log all your results into a text file which you can then save or share with others. The Windows Mobile IP Utility works on both Windows Mobile 5 & 6 devices that have the .NET Compact Framework 2.0 installed. (Thanks to Jason Langridge for the tip!)