asp.net: Do this and post back with the error:

.. This <customErrors> tag should then have its "mode" attribute
[quoted text, click to view]

I always found that web page written by ASP.NET (VB.NET) generate error when
starting at the first times. If I click refresh button on the IE again, it
can work as well.

What's wrong ?

Again if I terminate process aspnet_wp.exe, it will generate again ONLY at
the times to read page.

Following is the error seen on screen:

Server Error in '/' Application.
----------------------------------------------------------------------------
----

Runtime Error
Description: An application error occurred on the server. The current custom
error settings for this application prevent the details of the application
error from being viewed remotely (for security reasons). It could, however,
be viewed by browsers running on the local server machine.

Details: To enable the details of this specific error message to be viewable
on remote machines, please create a <customErrors> tag within a "web.config"
configuration file located in the root directory of the current web
application. This <customErrors> tag should then have its "mode" attribute
set to "Off".

<!-- Web.Config Configuration File -->

<configuration>
<system.web>
<customErrors mode="Off"/>
</system.web>
</configuration>


Notes: The current error page you are seeing can be replaced by a custom
error page by modifying the "defaultRedirect" attribute of the application's
<customErrors> configuration tag to point to a custom error page URL.

<!-- Web.Config Configuration File -->

<configuration>
<system.web>
<customErrors mode="RemoteOnly" defaultRedirect="mycustompage.htm"/>
</system.web>
</configuration>