Hello,

I'm new to Umbraco so this will be my first post here.

I have managed to set up a complete site in umbraco on my local machine so I'm starting to understand how Umbraco works (with all it's document types an templates).

Anyhow, right now I am working on another site and this one has to be run on a shared medium trust server (Windows Server 2008, IIS7.5). My first attempts to get it running failed miserably but after googling around I found the Umbraco 4.0.3 Medium Trust patch.

Hours later was finally able to reach the Umbraco back-end and began working on my site. The next day, when I was about to continue working on the site I went to the login page (domainname.com/umbraco/login.aspx), entered my credentials and clicked the login-button. And here is the scary part, I had an exception thrown in my face:

Server Error in '/' Application.

---

Object reference not set to an instance of an object.

Description: An unhandled 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: 

Stack Trace: 

[NullReferenceException: Object reference not set to an instance of an object.]
   umbraco.cms.presentation.login.Button1_Click(Object sender, EventArgs e) +643
   System.EventHandler.Invoke(Object sender, EventArgs e) +0
   System.Web.UI.WebControls.Button.OnClick(EventArgs e) +111
   System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +110
   System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +10
   System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +13
   System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +36
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1565

 What does this mean? I am not able to log back into Umbraco, it keeps crashing on me every time...

This is my major issue, but I also have another (not as much as a showstopper as the first one though). The site I was building uses web-services to call some server side logic. The webservices are built using asp.net 3.5 and they are being called from a javascript (jquery) using AJAX.

The script is run OK but the webservice returns a 500 error. Internal Server Error. My investigations came to the conclusion that when running the Umbraco 4.0.3 Medium Trust I am not able to run any .net3-specific code. Is there a work around for this or do I have to face the facts that I need to write everything in .net2.0?

Thanks for any help...