title: Error System.DirectoryServices.DirectoryServicesCOMException (0x8007203B): A local error has occurred
body: <p>I use following code below to verify user and password in LDAP:</p>
  
  <pre><code>        bool authentic = false;
  
          string ip_server = "10.53.41.21";
          string userName = "CN=test,N=Users,DC=user,DC=domain,DC=COM";
          string password = "something";
          try
          {
              DirectoryEntry entry = new DirectoryEntry("LDAP://" + ip_server, userName, password);
              //   entry.
              object nativeObject = entry.NativeObject;
              authentic = true;
          }
          catch (DirectoryServicesCOMException) { }
          return authentic;
  </code></pre>
  
  <p>It is run fine on local and IIS 6.0. But get error when run on IIS 7.0:</p>
  
  <pre><code>System.DirectoryServices.DirectoryServicesCOMException (0x8007203B): A local error has occurred.
  
     at System.DirectoryServices.DirectoryEntry.Bind(Boolean throwIfFail)
     at System.DirectoryServices.DirectoryEntry.Bind()
     at System.DirectoryServices.DirectoryEntry.get_NativeObject()
  </code></pre>
  
  <p>How to fix this problem? </p>
  
  <p>Thanks!</p>