I have read all the other "Server Application Unavailable" threads and
all are old and for .NET Framework 1.

I have Framework 2 running on Windows XP.

I have a problem with this big red text:
Server Application Unavailable

My ASP C# application is frame based with a menu on one side.
Pressing the menu link is no problem - the page displays as expected.
On this page call a popup window. Now the problems begins.
This popup window is a form that saves som data to a databse.
If the save is OK I call this JavaScript functions:

window.opener.location.reload(1);
self.close();
The popup window close as expected, but the opener window gives me the
following error:

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.

Administrator Note: An error message detailing the cause of this
specific request failure can be found in the application event log of
the web server. Please review this log entry to discover what caused
this error to occur.

I even tryed to harcode the link (from the menu) into my script:
window.opener.location.href = http://localhost/mypage.aspx
Even that gives me a error.

Any idea what can be wrong.