RE: Error while running a virtual site by using a mapped drive

Hello Sriram,

From your description, you have an ASP.NET (2.0?) application hosted on
IIS6/win2003 std server. And the IIS virtual directory is pointing to a
remote file share. However, when you try browsing or opening the
applciation in VS 2005, you got the following error, correct?

"Server cannot access application directory 'T:\InetPub\wwwroot\'. The
directory does not exist or is not accessible because of security settings."

Based on my experience, there are some possible things that can cause this
error:

** the virtual directory is not existing or accessible, for example, you
create a virtual dir pointing to a folder under a given user's user
profile(document_settings\userxxx\xxxx). Here is a web thread describe on
this:

http://blog.danbartels.com/archive/2005/04/22/579.aspx

** the IIS process doesn't have sufficient permission to access the
physical path of the virtual directory.

According to your scenario, you can check the two cases, if the virtual
directory is a well accessible UNC share, it is likely that the permission
is not correctly configured for the virtual directory's UNC share.

Generally, we should take care of the following things when hosting an
ASP.NET 2.0 web application in IIS which point to a UNC share

1.The UNC share is well accessible by the server machine(where the ASP.NET
application is hosted in IIS)

2. The UNC shared folder has two permission settings:
** the NTFS access permission
** the UNC share folder's access permission

You need to make sure a certain account(generally domain account for remote
machines scenario) have sufficient perssion to read/modify that UNC
share(and have sufficient permission on NTFS setting)

3. In the remote server's IIS virtual directory, when you set the home
directory to a UNC share, you can configure a "Connect As..." account for
it. This account is used by IIS to access the remove UNC share. As
mentioned in #2, you need to select an account(commonly a powerful domain
account) which has sufficient permission on the UNC share.

I've performed some tests in my local environment and ASP.NET 2.0 web
app(from a remove UNC share on a xp box) can works well in VS 2005(through
both IIS hosted or VS 2005 test server hosted cases). There is no
additional configuration requirement except the above things I mentioned.

Here are some IIS UNC share mapping related KB articles:

http://support.microsoft.com/kb/280383/en-us

http://support.microsoft.com/kb/257174/en-us

Hope this helps you.

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead



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