无法访问部分网页的问题

[mjikop1231]

nslookup 解析正常

可以 ping 通服务器

curl 异常，同时浏览器访问异常

curl 信息

curl -vv store.steampowered.com                                               
STATE: INIT => CONNECT handle 0x20071828; line 1407 (connection #-5000)       
Rebuilt URL to: store.steampowered.com/                                       
Added connection 0. The cache now contains 1 members                          
  Trying 104.127.221.102...                                                   
TCP_NODELAY set                                                               
STATE: CONNECT => WAITCONNECT handle 0x20071828; line 1460 (connection #0)    

然后就没有然后了

然而走代理可以访问？？？（非被禁网站，例如 store.steampowered.com ）