Q: Unable to start debugging on the web server. Microsoft Development Environment Error: Why i am seeing this eroor? A: This is the pitfall of IISLockdown. If you do not explicitly allow the DEBUG verb, URLScan prevents debugging. Also, URLScan blocks requests that contain unsafe characters such as the period (.) used for directory traversal. To configure URLScan, edit URLScan.ini in %Windir%\System32\inetsrv\urlscan\. To allow debugging with URLScan, add DEBUG to the [AllowVerbs] section in URLScan.ini as shown below.
[AllowVerbs]
GET
HEAD
POST
DEBUG
Note: You may not be able to create new Web projects in Visual Studio .NET because you use characters in the project name that URLScan rejects. For example, the comma (,) and the pound sign (#) will be blocked