用 网络蚂蚁 拉了大概 87% 后，无法再下载了，续传也被禁止，这是怎么回事呀？
2013/11/16 22:51:25 解析主机地址 …
2013/11/16 22:51:25 主机地址已确认
2013/11/16 22:51:25 连接到主机 (mirrors.tuna.tsinghua.edu.cn:80) …
2013/11/16 22:51:25 成功连接到主机
2013/11/16 22:51:25 GET /ubuntukylin-releases/releases/saucy/release/ubuntukylin-13.10-desktop-i386.iso HTTP/1.1
2013/11/16 22:51:25 Host: mirrors.tuna.tsinghua.edu.cn
2013/11/16 22:51:25 Accept: /
2013/11/16 22:51:25 User-Agent: NetAnts/1.25
2013/11/16 22:51:25 Pragma: no-cache
2013/11/16 22:51:25 Cache-Control: no-cache
2013/11/16 22:51:25 Connection: close
2013/11/16 22:51:25 Range: bytes=855396352-
2013/11/16 22:51:25 HTTP/1.1 403 Forbidden
2013/11/16 22:51:25 Server: nginx/1.2.1
2013/11/16 22:51:25 Date: Sat, 16 Nov 2013 14:51:31 GMT
2013/11/16 22:51:25 Content-Type: text/html
2013/11/16 22:51:25 Content-Length: 629
2013/11/16 22:51:25 Connection: close
2013/11/16 22:51:25 HTTP status code 403 : Forbidden