转到 C:\Documents and Settings\$your user name$\My Documents\IISExpress\config目录，打开applicationHost.config文件

找到

<asp scriptErrorSentToBrowser="true">
            <cache diskTemplateCacheDirectory="%TEMP%\iisexpress\ASP Compiled Templates" />
            <limits />
        </asp>

更改如下：

<asp
        enableParentPaths="true"  //启用父路径
        bufferingOn="true"
        errorsToNTLog="true"
        appAllowDebugging="true"
        appAllowClientDebug="true"
        scriptErrorSentToBrowser="true">

        <session allowSessionState="true" />
        <cache diskTemplateCacheDirectory="%TEMP%\iisexpress\ASP Compiled Templates" />
        <limits />
      </asp>

保存并重启 iis express.

参考：http://www.iis.net/ConfigReference/system.webServer/asp