Web Debug

Fix broken web applications, from servers to clients.

IIS7 Error: Bad Data 0x80090005

app pool errorWhen you try to change the application pool identity to another domain account or reset the password for that account. You type in the username and password and hit OK and you will get the following error message

There was an error while performing this operation.

Details: Bad Data. (Exception from HRESULT: 0x80090005)

Usually this is caused by Xcopy the applicationHost.config from one server to another. And on original server you changed the application pool identity to a custom identity. (Advanced Settings > Application Pool Identity > Custom Account).

IE Redirection Limit

301-302-redirectUsers might get “This page can’t be displayed” error in IE7 or IE8 when a website requires too many redirections to go to the destination page. The question is how much redirection will be considered as “too many”.

IE7 and IE8 sets the default value of redirection limit as 10, so if a webpage causes more than 10 continuous redirection, “Page can’t be displayed” error will be displayed.

This limit can be changed by adding the following registry key,

HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings

Value: MaxHttpRedirects

Type: DWORD

However, from IE9 IE has increase this value by multiplying a coefficient (11). Since the default value of MaxHttpRedirects is kept as 10, the redirection limit will be 10*11 = 110 since IE9.

If you chance the registry to 20, then the redirection limit will be 20 * 11 = 220.

Build webkit with VS2013 and Windows 8.1

OS: Windows 8.1

IDE: Visual Studio 2013

  1. You can build with either Visual Studio 2013 or Visual Studio 2013 express. (Newer versions currently unsupported)
    Use the default options for the installation.
  2. Install Cygwin
    Cygwin is a collection of utilities for Windows that includes not only a Subversion client, but also additional tools that are required to build the WebKit source. We have made a downloader available that automatically collects all of the required packages.
Troubleshooting .NET Memory Issue

MSDN Magazine - Investigating Memory Issues

Main interface_2Uncovering and correcting memory issues in managed applications can be difficult. Memory issues manifest themselves in different ways. For example, you may observe your application's memory usage growing unboundedly, eventually resulting in an Out Of Memory (OOM) exception. (Your application may even throw out-of-memory exceptions when there is plenty of physical memory available.) But any one of the following may indicate a possible memory issue:

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  • An OutOfMemoryException is thrown.
  • The process is using too much memory for no obvious reason that you can determine.
  • It appears that garbage collection is not cleaning up objects fast enough.
  • The managed heap is overly fragmented.
  • The application is excessively using the CPU.


This column discusses the investigation process and shows you how to collect the data you need to determine what types of memory issues you are dealing with in your applications. This column does not cover how to actually fix problems you find, but it does give some good insights as to where to start.

Garbage Collection and Performance


This topic describes issues related to garbage collection and memory usage. It addresses issues that pertain to the managed heap and explains how to minimize the effect of garbage collection on your applications. Each issue has links to procedures that you can use to investigate problems.

This topic contains the following sections:

CLR GC Toturials

Defrag Tools: #33 - CLR GC - Part 1


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: #34 - CLR GC - Part 2


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: #35 - CLR GC - Part 3


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: #36 - CLR GC - Part 4


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

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