1. 检查 web.config 文件中的 debugging 选项设置 (True or False).
2. 检查 web.config 文件中的 IP 地址 和 机器名.
3. 根据Q316970篇文章, 检查cache设置.
[Title: Q316970 PRB: Debugger Fails to Hit Breakpoint on Second Pass in ASP.NET]
http://support.microsoft.com/default.aspx?scid=kb;en-us;Q316970
更多相关的信息和说明请参考下面这些资料:
[Title: PRB: Visual Studio .NET Debugger Does Not Stop on Breakpoints When You Debug ASP.NET Pages]
http://support.microsoft.com/default.aspx?scid=kb;en-us;Q306169
[Title:PRB: Debugger Does Not Hit Breakpoint (Client Debug)]
http://support.microsoft.com/default.aspx?scid=kb;en-us;Q320000
[Title: Q316726 HOW TO: Debug an ASP.NET Web Application]
http://support.microsoft.com/default.aspx?scid=kb;en-us;Q316726