I was working with the Adrotator component included in .NET 2.0 on Vista and IIS7. I was getting this error; BC32400: Class 'CLSID_CorSymWriter' could not be created: Access is denied. It worked on my other vista machine, so I knew it was specific to my machine. I ran Process Monitor (aka Filemon) and found two registry keys that were getting denied. After adding Network Service with READ permissions, this started working. PS: It was fun to actually use Filemon to track down a problem of my own, I mention this tool in many newsgroup posting.
Here is a picture of the output.
Here is the raw output of the error
Server Error in '/' Application.
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Compilation Error
Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.
Compiler Error Message: BC32400: Class 'CLSID_CorSymWriter' could not be created: Access is denied.
Source Error:
[No relevant source lines]
Source File: vbc : Line: 0
Show Detailed Compiler Output:
c:\windows\system32\inetsrv> "C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe" /t:library /utf8output /R:"C:\Windows\assembly\GAC_32\System.Web\2.0.0.0__b03f5f7f11d50a3a\System.Web.dll" /R:"C:\Windows\assembly\GAC_MSIL\System.ServiceModel\3.0.0.0__b77a5c561934e089\System.ServiceModel.dll" /R:"C:\Windows\assembly\GAC_32\System.Data\2.0.0.0__b77a5c561934e089\System.Data.dll" /R:"C:\Windows\assembly\GAC_MSIL\System.Web.Mobile\2.0.0.0__b03f5f7f11d50a3a\System.Web.Mobile.dll" /R:"C:\Windows\assembly\GAC_32\System.EnterpriseServices\2.0.0.0__b03f5f7f11d50a3a\System.EnterpriseServices.dll" /R:"C:\Windows\assembly\GAC_MSIL\System.Xml\2.0.0.0__b77a5c561934e089\System.Xml.dll" /R:"C:\Windows\assembly\GAC_MSIL\System.Runtime.Serialization\3.0.0.0__b77a5c561934e089\System.Runtime.Serialization.dll" /R:"C:\Windows\assembly\GAC_MSIL\System.Configuration\2.0.0.0__b03f5f7f11d50a3a\System.Configuration.dll" /R:"C:\Windows\assembly\GAC_MSIL\System.IdentityModel\3.0.0.0__b77a5c561934e089\System.IdentityModel.dll" /R:"C:\Windows\assembly\GAC_MSIL\System\2.0.0.0__b77a5c561934e089\System.dll" /R:"C:\Windows\assembly\GAC_MSIL\System.Web.Services\2.0.0.0__b03f5f7f11d50a3a\System.Web.Services.dll" /R:"C:\Windows\assembly\GAC_MSIL\System.Drawing\2.0.0.0__b03f5f7f11d50a3a\System.Drawing.dll" /out:"C:\Windows\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\root\26676eb7\92c7e946\App_Web_ads.aspx.cdcab7d2.p_oyg97i.dll" /D:DEBUG=1 /debug+ /define:_MYTYPE=\"Web\" /imports:Microsoft.VisualBasic,System,System.Collections,System.Collections.Specialized,System.Configuration,System.Text,System.Text.RegularExpressions,System.Web,System.Web.Caching,System.Web.SessionState,System.Web.Security,System.Web.Profile,System.Web.UI,System.Web.UI.WebControls,System.Web.UI.WebControls.WebParts,System.Web.UI.HtmlControls "C:\Windows\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\root\26676eb7\92c7e946\App_Web_ads.aspx.cdcab7d2.p_oyg97i.0.vb" "C:\Windows\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\root\26676eb7\92c7e946\App_Web_ads.aspx.cdcab7d2.p_oyg97i.1.vb"
Microsoft (R) Visual Basic Compiler version 8.0.50727.312
for Microsoft (R) .NET Framework version 2.0.50727.312
Copyright (c) Microsoft Corporation. All rights reserved.
vbc : error BC32400: Class 'CLSID_CorSymWriter' could not be created: Access is denied.
vbc : error BC31019: Unable to write to output file 'C:\Windows\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\root\26676eb7\92c7e946\App_Web_ads.aspx.cdcab7d2.p_oyg97i.pdb': Access is denied.
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Version Information: Microsoft .NET Framework Version:2.0.50727.312; ASP.NET Version:2.0.50727.312
Steve Schofield
Microsoft MVP - IIS