This is the second part of troubleshooting HTTP 500.19 errors in IIS 7. You can read the first part of this article here.

So, let start it.

Error Message #5:

HTTP Error 500.19 - Internal Server Error
Description: The requested page cannot be accessed because the related configuration data for the page is invalid.
Error Code: 0x8007052e
Notification: BeginRequest
Module: IIS Web Core
Requested URL: http://localhost/
Logon User: Not yet determined
Logon Method: Not yet determined
Handler: Not yet determined
Config Error: Cannot read configuration file
Config File: \\?\UNC\isha2003\wwwroot\web.config

Reason:

The error code in this 500.19 error message is 0x8007052e which indicates:

ERROR_LOGON_FAILURE - Logon failure: unknown user name or bad password.

Solution:

To resolve this error, follow the steps given in the KB 934515.

Error Message #6:

HTTP Error 500.19 - Internal Server Error
The requested page cannot be accessed because the related configuration data for the page is invalid. Module DynamicCompressionModule
Notification SendResponse
Handler StaticFile
Error Code 0x8007007e
Requested URL http://localhost:80/
Physical Path C:\inetpub\wwwroot
Logon Method Anonymous
Logon User Anonymous

Reason:

Error Code 0x8007007e is:

ERROR_MOD_NOT_FOUND - The specified module could not be found.

This problem occurs because the ApplicationHost.config file or the Web.config file references a module that is invalid or that does not exist. To resolve this problem: In the ApplicationHost.config file or in the Web.config file, locate the module reference or the DLL reference that is invalid, and then fix the reference. To determine which module reference is incorrect, enable Failed Request Tracing, and then reproduce the problem.

For above specific error (mentioned in this example), DynamicCompressionModule module is causing the trouble. This is because of the XPress compression scheme module (suscomp.dll) which gets installed with WSUS. Since Compression schemes are defined globally and try to load in every application Pool, it will result in this error when 64bit version of suscomp.dll attempts to load in an application pool which is running in 32bit mode.

This module entry looks like:

<scheme name="xpress" doStaticCompression="false" doDynamicCompression="true"
dll="C:\Windows\system32\inetsrv\suscomp.dll" staticCompressionLevel="10"
dynamicCompressionLevel="0" />

Hence to get rid of this problem:

Ø Remove/Disable the XPress compression scheme from the configuration using the command below:

%windir%\system32\inetsrv\appcmd.exe set config -section:system.webServer/httpCompression /-[name='xpress']

OR

Ø Add an attribute of "precondition= "64bitness" for this module entry so that it loads only in 64bit application pools

Refer this blog for more details on Preconditions in IIS7

OR

Ø Use a 32bit version of suscomp.dll

Error Message #7:

HTTP Error 500.19 - Internal Server Error

The requested page cannot be accessed because the related configuration data for the page is invalid. Detailed Error Information

Module IIS Web Core
Notification BeginRequest
Handler Not yet determined
Error Code 0x80070021
Config Error: This configuration section cannot be used at this path. This happens when the section is locked at a parent level. Locking is either by default (overrideModeDefault="Deny"), or set explicitly by a location tag with overrideMode="Deny" or the legacy allowOverride="false".
Config File \\?\C:\inetpub\wwwroot\web.config
Requested URL http://localhost:8081/
Physical Path C:\inetpub\wwwroot\
Logon Method Not yet determined
Logon User Not yet determined
Config Source

144: </modules>
145: <handlers>
146: <remove name="WebServiceHandlerFactory-Integrated"/>

Reason:

ERROR CODE: 0x80070021 is

ERROR_LOCK_VIOLATION The process cannot access the file because another process has locked a portion of the file.

Solution:

There are usually a few more lines in that error response that points to the exact line in the config file (and hence the locked section) that has the problem. You will either have to unlock that section or not use it in your application’s web.config file.

For e.g., one can lock/unlock handlers/modules sections by either

Ø use appcmd.exe
%windir%\system32\inetsrv\appcmd unlock config -section:system.webServer/handlers
%windir%\system32\inetsrv\appcmd unlock config -section:system.webServer/modules

OR

Ø manually change value from "Deny" to "Allow" for below settings in %windir%\system32\inetsrv\config\ applicationHost.config
<section name="handlers" overrideModeDefault="Deny" />
<section name="modules" allowDefinition="MachineToApplication" overrideModeDefault="Deny"/>

You can also configure the locking via IIS manager UI.

In above error message, the error occurred on the handlers section at:

<remove name="WebServiceHandlerFactory-Integrated"/>”

This usually indicates that ASP.NET is either not installed or has corrupted/incomplete installation because installation of asp.net unlocks that section. Hence if this is the case, one should install asp.net feature from Server Manager (Under Web Server Role in Windows Server 2008 and in Program Features-> Application server in Vista/Windows7). This KB929772 talks about the ASP.NET installation failure reason.

Error Message #8:

HTTP Error 500.19 - Internal Server Error
Description: The requested page cannot be accessed because the related configuration data for the page is invalid.
Error Code: 0x80070005
Notification: BeginRequest
Module: IIS Web Core
Requested URL: http://localhost
Physical Path: C:\Inetpub\wwwroot
Logon User: Not yet determined
Logon Method: Not yet determined
Handler: Not yet determined
Config Error: Cannot read configuration file
Config File: \\?\ C:\Inetpub\wwwroot\web.config

Reason:

The error code 0x80070005 is:

E_ACCESSDENIED - General access denied error

The “Config error” portion of the error may indicate this too, via message: “Config Error Cannot read configuration file due to insufficient permissions ”

Solution:

Grant Read permission to the IIS_IUSRS group for the ApplicationHost.config file or for the Web.config file indicated in the error message. Even if there is no config file at that location, the worker process identity (and/or the IIS_IUSRS group) needs at least Read access to the directory so that it can check for a web.config file in that directory.  If it’s a UNC share, you need to either run your app-pool as an account that has sufficient permission to the UNC share or configure the virtual directory with a user that has sufficient permission to the share.

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