之后dist-upgrade我无法更新 Kali 并sudo apt-get update返回此错误：
Err:1 http://http.kali.org/kali kali-rolling InRelease
Connection failed [IP: 192.99.200.113 80]
Reading package lists... Done
W: Failed to fetch http://http.kali.org/kali/dists/kali-rolling/InRelease Connection failed [IP: 192.99.200.113 80]
W: Some index files failed to download. They have been ignored, or old ones used instead.
我在 Kali 中搜索了更新错误，但找不到这个错误。
这是我的sources.list文件：
#
#deb cdrom:[Debian GNU/Linux 2017.3 _Kali-rolling_ - Official Snapshot amd64 LIVE/INSTALL Binary 20171109-13:49]/ kali-rolling contrib main non-free
#deb cdrom:[Debian GNU/Linux 2017.3 _Kali-rolling_ - Official Snapshot amd64 LIVE/INSTALL Binary 20171109-13:49]/ kali-rolling contrib main non-free
deb http://http.kali.org/kali kali-rolling main non-free contrib
# deb-src http://http.kali.org/kali kali-rolling main non-free contrib
我怎样才能解决这个问题？