[程序设计]求助:SSL证书提供者有哪些?

parser error我做网页(asp.net)配置web.config的时候,总是发现如下的错误:

　　Configuration Error

　　Description: An error occurred during the processing of a configuration file required to service this request. Please review the specific error details below and modify your configuration file appropriately.

　　Parser Error Message: It is an error to use a section registered as allowDefinition='MachineToApplication' beyond application level. This error can be caused by a virtual directory not being configured as an application in IIS.

　　Source Error:

　　Line 50: -->

　　Line 51:

　　Line 52:

　　Line 53:

　　Source File: F:\action\bbs\web.config Line: 51

　　网上说是没有安装证书的缘故,但我不知道SSL证书提供者有哪些啊parser error。哪位达人知道啊？摆脱哦