加密web.config中的成员资格元素时出现问题

我正在尝试加密.Net应用程序的Web.Config中的"system.web.membership"元素,以保护Active Directory的用户名和密码.我正在使用aspnet_regiis命令进行加密,并为"pe"选项的值尝试了几个不同的字符串但没有成功.我已成功加密web.config上的"connectionstrings"元素.

CMD

C:\Windows\Microsoft.NET\Framework\v2.0.50727>aspnet_regiis -pe "connectionStrings" -site MySite -app /MyApp
Encrypting configuration section...
Succeeded!

C:\Windows\Microsoft.NET\Framework\v2.0.50727>aspnet_regiis -pe "membership" -site MySite -app /MyApp
Encrypting configuration section...
The configuration section 'membership' was not found.
Failed!

C:\Windows\Microsoft.NET\Framework\v2.0.50727>aspnet_regiis -pe "system.web.membership" -site MySite -app /MyApp
Encrypting configuration section...
The configuration section 'system.web.membership' was not found.
Failed!

Web.Config中

    ...
    
        ...
        
            
        
        
            
            
        
        
            
                
            
        
        ...
    
    ...

什么给出了什么？我错过了什么？

配置部分用" system.web/membership" 标识,而不是" membership"或" system.web.membership".