apt不能更新帮忙看一下什么原因

pdaliu

Ign http://security.debian.org etch Release.gpg
Get:1 http://security.debian.org etch/updates Release.gpg [189B]
Ign http://security.debian.org etch Release
Hit http://security.debian.org etch/updates Release
Ign http://security.debian.org etch/main Packages
Ign http://security.debian.org etch/contrib Packages
Ign http://security.debian.org etch/updates/main Sources/DiffIndex
Ign http://security.debian.org etch/updates/contrib Sources/DiffIndex
Err http://security.debian.org etch/main Packages
  404 Not Found [IP: 212.211.132.250 80]
Err http://security.debian.org etch/contrib Packages
  404 Not Found [IP: 212.211.132.250 80]
Hit http://security.debian.org etch/updates/main Sources
Hit http://security.debian.org etch/updates/contrib Sources
Fetched 1B in 4s (0B/s)
Failed to fetch http://security.debian.org/dists ... ry-i386/Packages.gz  404 Not Found [IP: 212.211.132.250 80]
Failed to fetch http://security.debian.org/dists ... ry-i386/Packages.gz  404 Not Found [IP: 212.211.132.250 80]
Reading package lists... Done
W: Couldn't stat source package list http://security.debian.org etch/main Packages (/var/lib/apt/lists/security.debian.org_dists_et                          ch_main_binary-i386_Packages) - stat (2 No such file or directory)
W: Couldn't stat source package list http://security.debian.org etch/contrib Packages (/var/lib/apt/lists/security.debian.org_dists                          _etch_contrib_binary-i386_Packages) - stat (2 No such file or directory)
W: You may want to run apt-get update to correct these problems
E: Some index files failed to download, they have been ignored, or old ones used instead.
proxy:~# ping  212.211.132.250
PING 212.211.132.250 (212.211.132.250) 56(84) bytes of data.
64 bytes from 212.211.132.250: icmp_seq=1 ttl=49 time=513 ms
64 bytes from 212.211.132.250: icmp_seq=2 ttl=49 time=489 ms
64 bytes from 212.211.132.250: icmp_seq=3 ttl=49 time=441 ms
64 bytes from 212.211.132.250: icmp_seq=4 ttl=49 time=442 ms