This happens when the asp_regiis command fails for some reason. The CCNET installer tries to execute the following command:

   "C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\aspnet_regiis.exe" -s "W3SVC/1/ROOT/ccnet"

Please try that by hand and let us know what happens.

Hi.

Thank you for the reply.

The work around is to enable 32-bit apps on 64-bit in IIS by running:
1. cscript.exe C:\Inetpub\AdminScripts\adsutil.vbs SET W3SVC/AppPools/Enable32bitAppOnWin64 1
2. "C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\aspnet_regiis.exe" -r
3. "C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\aspnet_regiis.exe" -s "W3SVC/1/ROOT/ccnet"


Here is the detailed output:

C:\Documents and Settings\Administrator>"C:\WINDOWS\Microsoft.NET\Framework\v2.0
.50727\aspnet_regiis.exe" -s "W3SVC/1/ROOT/ccnet"
The error indicates that IIS is in 64 bit mode, while this application is a 32 b
it application and thus not compatible.

C:\Documents and Settings\Administrator>cscript.exe C:\Inetpub\AdminScripts\adsu
til.vbs SET W3SVC/AppPools/Enable32bitAppOnWin64 1
Microsoft (R) Windows Script Host Version 5.6
Copyright (C) Microsoft Corporation 1996-2001. All rights reserved.

Enable32bitAppOnWin64 : (BOOLEAN) True

C:\Documents and Settings\Administrator>"C:\WINDOWS\Microsoft.NET\Framework\v2.0
.50727\aspnet_regiis.exe" -s "W3SVC/1/ROOT/ccnet"
Start registering ASP.NET scriptmap (2.0.50727) recursively at W3SVC/1/ROOT/ccne
t.
The error indicates that this version of ASP.NET must first be registered on the
 machine.

C:\Documents and Settings\Administrator>"C:\WINDOWS\Microsoft.NET\Framework\v2.0
.50727\aspnet_regiis.exe" -r
Start installing ASP.NET (2.0.50727) and replacing ASP.NET DLL in all Scriptmaps
 with current version.
.................................................
Finished installing ASP.NET (2.0.50727) and replacing ASP.NET DLL in all Scriptm
aps with current version.

C:\Documents and Settings\Administrator>"C:\WINDOWS\Microsoft.NET\Framework\v2.0
.50727\aspnet_regiis.exe" -s "W3SVC/1/ROOT/ccnet"
Start registering ASP.NET scriptmap (2.0.50727) recursively at W3SVC/1/ROOT/ccne
t.
Finished registering ASP.NET scriptmap (2.0.50727) recursively at W3SVC/1/ROOT/c
cnet.

Very interesting. CCNET is a pure-.NET C# application, and is compiled to MSIL, not to 32-bit machine code, so I'm surprised that IIS complained. I was actually expecting you to come back and say that aspnet_regiis was located somewhere else. But this is surprising.

Well there is another aspnet_regiis.exe here:

C:\WINDOWS\Microsoft.NET\Framework64\v2.0.50727\aspnet_regiis.exe

But I have yet to try it.

Please check out your registry and tell me:

1) What keys are under HKLM\Software\Microsoft\.NetFramework\policy\v2.0

2) What is the value of HKLM\Software\Microsoft\.NetFramework\InstallRoot

I think the issue may be that CCNET should be using the version of aspnet_regiis.exe that is in Framework64, not the version in Framework.

HKLM\Software\Microsoft\.NetFramework\policy\v2.0

Has one key (REG_SZ):
50727
with value:
50727-50727

The value of HKLM\Software\Microsoft\.NetFramework\InstallRoot is:
C:\WINDOWS\Microsoft.NET\Framework64\

Thank you.
:)

On 64-bit machines there is also this registry key:
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\.NETFramework

And the value of InstallRoot there is
C:\WINDOWS\Microsoft.NET\Framework\

And so maybe the ccnet setup installer should disable registry redirection when running on x64.

Here is some more technical information:
http://support.microsoft.com/kb/896459

Revision #4014 changes createCCNetVDir.vbs to locate aspnet_regiis.exe via the chain of registry keys rather than by a hard-coded pathname.