安装vnc server，一直显示连接源失败

不能发带有连接的，，，，部分信息我改了下
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./install_vnc_server.sh
Step 1.No lock file,begin to create lock file and continue.


Step 2.Begen to check the OS issue.


This OS is centos7.


Step 3.Begen to modify the source configration file and update.


--2017-08-10 00:50:26--  http: / / oss.aliyuncs.com/aliyunecs/update_source.tgz?spm=5176.7150518.1996836753.5.67nzlg&file=update_source.tgz
Resolving oss.aliyuncs.com (oss.aliyuncs.com)... 118.178.29.4
Connecting to oss.aliyuncs.com (oss.aliyuncs.com)|118.178.29.4|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 2122 (2.1K) [application/octet-stream]
Saving to: ‘update_source.tgz’


100%[======================================================================================================>] 2,122       --.-K/s   in 0s      


2017-08-10 00:50:26 (301 MB/s) - ‘update_source.tgz’ saved [2122/2122]


update_source.sh
Step 1.No lock file,begin to create lock file and continue.


Step 2.Begin to check the OS issue.


This OS is centos7.


Step 3.Begin to modify the source configration file and update.


--2017-08-10 00:50:26--  http : //mirrors.aliyuncs.com/repo/Centos-7.repo
Resolving mirrors.aliyuncs.com (mirrors.aliyuncs.com)... 10.143.34.200
Connecting to mirrors.aliyuncs.com (mirrors.aliyuncs.com)|10.143.34.200|:80... failed: Connection timed out.
Retrying.


--2017-08-10 00:52:35--  (try: 2)  http : //mirrors.aliyuncs.com/repo/Centos-7.repo
Connecting to mirrors.aliyuncs.com (mirrors.aliyuncs.com)|10.143.34.200|:80... failed: Connection timed out.
Retrying.


--2017-08-10 00:54:44--  (try: 3)  http : //mirrors.aliyuncs.com/repo/Centos-7.repo
Connecting to mirrors.aliyuncs.com (mirrors.aliyuncs.com)|10.143.34.200|:80... failed: Connection timed out.
Retrying.


--2017-08-10 00:56:54--  (try: 4)  http : //mirrors.aliyuncs.com/repo/Centos-7.repo
Connecting to mirrors.aliyuncs.com (mirrors.aliyuncs.com)|10.143.34.200|:80...