问yum 默认的腾讯镜像无法使用？

[root@VM_0_8_centos yum.repos.d]# yum -y install lrzsz

Loaded plugins: fastestmirror, langpacks

Determining fastest mirrors

base | 3.6 kB 00:00:00

http://mirrors.tencentyun.com/epel/7/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://mirrors.tencentyun.com/epel/7/x86_64/repodata/repomd.xml: (28, 'Connection timed out after 30001 milliseconds')

Trying other mirror.

http://mirrors.tencentyun.com/epel/7/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://mirrors.tencentyun.com/epel/7/x86_64/repodata/repomd.xml: (28, 'Connection timed out after 30001 milliseconds')

Trying other mirror.

http://mirrors.tencentyun.com/epel/7/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://mirrors.tencentyun.com/epel/7/x86_64/repodata/repomd.xml: (28, 'Connection timed out after 30001 milliseconds')

Trying other mirror.

http://mirrors.tencentyun.com/epel/7/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://mirrors.tencentyun.com/epel/7/x86_64/repodata/repomd.xml: (28, 'Connection timed out after 30001 milliseconds')

Trying other mirror.

http://mirrors.tencentyun.com/epel/7/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://mirrors.tencentyun.com/epel/7/x86_64/repodata/repomd.xml: (28, 'Connection timed out after 30001 milliseconds')

Trying other mirror.

http://mirrors.tencentyun.com/epel/7/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://mirrors.tencentyun.com/epel/7/x86_64/repodata/repomd.xml: (28, 'Connection timed out after 30001 milliseconds')

Trying other mirror.