IIS 6 出于安全考虑, 默认最大请求200K(也即最大提交数据限额为200KByte, 204800Byte).

解决办法:

1. 关闭 IIS Admin Service 服务
2. 打开 \Windows\system32\inesrv\metabase.xml
3.  修改 ASPMaxRequestEntityAllowed 的值为自己需要的, 默认为 204800
4.  启动 IIS Admin Service

Addon: 解决方法2

1. 新建文本文件：'use VBS set obj1=GetObject("winmgmts:/root/MicrosoftIISv2") set obj2=obj1.get("IIsWebVirtualDirSetting='W3SVC/1/ROOT'") 'Output default value WScript.Echo "AspMaxRequestEntityAllowed Default Value: " & obj2.AspMaxRequestEntityAllowed 'Reset the value obj2.AspMaxRequestEntityAllowed=1024000 ' set to 1mbyte, u can set to other what you want :) ' Save data obj2.Put_() 'Output new value WScript.Echo "AspMaxRequestEntityAllowed New Value: " & obj2.AspMaxRequestEntityAllowed

2. 保存为requestchange.vbs
3. 进入命令行, 运行:
cscript [path]requestchange.vbs

原文出处：  http://www.51windows.net/data/?url=/data/files/file_76.asp