IIS7 giving Object reference not set to an instance of an object error

I have an IIS7 application that is using the .net 4.0 framework. The application pool has the rights (read/write/execute) on the folder of the application and has (select/read/connect) rights to the Database. IIS7 accept the aspx files and everything seems fine int eh settings however i am getting a 404 error when I am calling ti from outside of the server.

When I go in the server and call the http://localhost link, i get this error

    Server Error in '/Phonebook/PhoneBook' Application.
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Object reference not set to an instance of an object.  
Description: An unhanded exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error: 

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.  

Stack Trace: 


[NullReferenceException: Object reference not set to an instance of an object.]
   PhoneBookApplication.DBUtils.Execute(SqlCommand command) +399
   PhoneBookApplication._Default.FillddlSearch() +156
   PhoneBookApplication._Default.Page_Load(Object sender, EventArgs e) +54
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +24
   System.Web.UI.Control.LoadRecursive() +70
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3047




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Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.1 

If I call a default-defaut.html file, it works, but not if开发者_运维技巧 I call the default-defaut.aspx. But in the daufault pages settings, both aspx and html are there.

Also, it seems to have something to do with the sql server, but I do not understand where to look to debug that

I have no idea what is doing this. Can someone help?

The method DBUtils.Execute seems to have an error. What do do you have on the page_load or any event before the page_load ?

The error is telling you exactly where the problem is:

Your line 399 of the DBUtils class has a bug:

PhoneBookApplication.DBUtils.Execute(SqlCommand command) +399

IIS is not the problem. If you are getting a 404 error is because you are not going to the correct URL.