从asp.net应用程序访问网络共享。 在Visual Studio中工作，但在IIS中工作，为什么？

Question

I have a network share in the intranet that allows write access to everyone (guest)

So, i wrote a program (mojoportal module, anyway it's the same, i think) in c# that writes some files in that path, and in visual studio works great.

Now, using the same program in IIS 7.5, does not work, i get this exception:

System.Net.WebException: An exception occurred during a WebClient request. ---> System.IO.IOException - Logon failure: unknown user name or bad password.

Well... since the access on the smb share is granted to everybody, i don't understand why it does not work on IIS...

The code is this:

WebClient wc = new WebClient();
wc.DownloadFile(urltodownload, smbshare);

What it can be? Thanks

Answer 1

Your IIS service not granted to access file share by default. You could try run your site with app pool identity set to Local System , or manually control the identity under which code is executed from web.config:

<system.web>
  <identity impersonate="true" userName="user with correct rights or admin" password="password"/>
  ...

Answer 2

Have you tried setting the credentials?

I believe that the everyone group still requires a valid credential of some sort, without setting the credentials you are anonymous...

wc.Credentials = CredentialCache.DefaultCredentials;

Answer 3

It looks like its not an issue with accessing the SMB share, its an issue accessing the website stored in urltodownload . Like Richard said, you may want to use the default credentials ie wc.UseDefaultCredentials = true; or some specific set of credentials or set up the web site at urltodownload to accept anonymous connections.

Refer to what can cause WebException for the DownloadFile method @ MSDN .

Answer 4

You need some kind of credentials to use a share from asp.net. You can setup an impersonation on the web.config or set wc.Credentials using network credentials. In the web.config you would set the follwoing under the system.web section:

<identity impersonate="true" userName="username_here" password="password_here" />

Answer 5

For my Visual Studio application (WinForms), it was a simple act of creating a strong name key (SNK) for the application to use.

I'm not sure why.

Perhaps creating a SNK in Visual Studio has a way of setting these Credentials that the other authors above me are referring to.

Hope this helps.