Cent os 7 Error downloading packages: 解决方法

yum一直用的好好地，今天安装NTP 忽然报了一个错：centos Error downloading packages:   autogen-libopts-5.18-5.el7.x86_64: [Errno 256] No more mirrors to try.   ntp-4.2.6p5-28.el7.centos.x86_64: [Errno 256] No more mirrors t

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