IIS 7 ISAPI Extensions Debugger
1.ISAPI设置添加方式请见http://technet.microsoft.com/en-us/library/cc771240(WS.10).aspx，需要在Handler Mappings将Permissions的Execute打开。
一开始在HandlerMappings中添加ISAPI的DLL，发现怎么也无法访问。后来发现原来是因为Win2008R2（X64）而DLL是32位的原因。需要设置 IIS支持32位。方法为,打开“Internet Information Services (IIS)Manager”，在Application Pools中选择站点的AppPool，在右侧面板上单击”AdvancedSetting”->”Enable 32-Bit Applications” 设置为True。
2.调试
使用Visual Studio Attach 到 w3wp 进程，访问DLL却无法进行Debugger，折腾啊折腾，发现和AppPool的.NET Framework设置有关，设置成”No Managed Code”就OK了。
记录一下免得以后又重新折腾。
Q1.404.2 The page you are requesting cannot be served because of the ISAPI and CGI Restriction list settings on the Web server
default IIS 7 does not allow ISAPI and CGI through .Net 1.1 bydefault. So if you are working with older code on IIS7 you will need tofollow these steps to resolve the issue:
1. Open IIS and click the server name
2. Double click “ISAPI and CGI Restrictions”
3. Right click ASP.NET v1.1 and select “allow”
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