Server Application Unavailable

Forresten så benytter jeg en FileUpload-kontrol i applikationen, og det er sikkert dette, som forårsager sikkerhedsproblemerne.

Før denne fejl fik jeg fejlen:

Why do I get the error message "Server Application Unavailable The web application you are attempting to access on this web server is currently unavailable. Please hit the "Refresh" button in your web browser to retry your request.

Den rettede jeg med rettighederne til brugeren som skrevet på:
http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=178434&SiteID=1

Jeg ved ikke, om fejlene er relateret...?

Men jeg vil tro, det har noget med rettigheder at gøre. For inde i Event Vieweren får jeg ved hver kørsel 3 fejl, hvor rodfejlen er:

Exception: System.IO.FileLoadException

Message: Could not load file or assembly 'System.Web, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. Access is denied.

StackTrace:    at System.Reflection.Assembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, Assembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection)
  at System.Reflection.Assembly.nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, Assembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection)
  at System.Reflection.Assembly.InternalLoad(AssemblyName assemblyRef, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection)
  at System.Reflection.Assembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection)
  at System.Activator.CreateInstance(String assemblyName, String typeName, Boolean ignoreCase, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes, Evidence securityInfo, StackCrawlMark& stackMark)
  at System.Activator.CreateInstance(String assemblyName, String typeName)
  at System.AppDomain.CreateInstance(String assemblyName, String typeName)
  at System.AppDomain.CreateInstance(String assemblyName, String typeName)
  at System.Web.Hosting.ApplicationManager.CreateAppDomainWithHostingEnvironment(String appId, IApplicationHost appHost, HostingEnvironmentParameters hostingParameters)
  at System.Web.Hosting.ApplicationManager.CreateAppDomainWithHostingEnvironmentAndReportErrors(String appId, IApplicationHost appHost, HostingEnvironmentParameters hostingParameters)

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

Jeg har også læst et sted, at der skal ligge en web.config i IIS-root. Men det gør der ikke ved mig. SKal jeg selv oprette sådan en?
Ligeledes har jeg læst, at der skal konfigureres en Mashine.config, når klienten skal have adgang til bibliotekker. Hvordan kan jeg gøre dette?

Jeg skulle blot følge denne vejledning:

1.    In Windows Explorer, browse to the folder that contains the root Web site (which is C:\Inetpub\Wwwroot by default) or the virtual directory.
2.    Right-click the folder, and then click Properties.
3.    On the Security tab, click Add.
4.    Type ComputerName\ASPNET (for example, on a computer named Webdev, type Webdev\ASPNET), and then click OK.
5.    Allow the following permissions for the ASPNET account:
•    Read & Execute
•    List Folder Contents
•    Read

6.    Click OK to close the Properties dialog box and to save the changes.