ASAHIネット(http://www.asahi-net.or.jp)のjouwa/salonからホットコーナー(http://www.asahi-net.or.jp/~ki4s-nkmr/ )に転載したものから。
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　MSのサイト、msn.comにある、これは一体何なのでしょうか。これも1ヵ月半
くらい前に見つけたと思うんですが、以来、ずっとこのままです。

http://ld.cb.msn.com/
Server Error in '/' Application.

をどうぞ。

　エラーメッセージがなくなるといけないので、以下に引用。
--- ここから ---
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>
--- ここまで ---