[求助] 安装过程中提示好多包找不到，怎么解决啊

wtwei

mhash-0.9.9-1.el6.rf.x86_64: failure: RPMS/mhash-0.9.9-1.el6.rf.x86_64.rpm from rpmforge: [Errno 256] No more mirrors to try.
  mhash-devel-0.9.9-1.el6.rf.x86_64: failure: RPMS/mhash-devel-0.9.9-1.el6.rf.x86_64.rpm from rpmforge: [Errno 256] No more mirrors to try.
  libmcrypt-2.5.7-1.2.el6.rf.x86_64: failure: RPMS/libmcrypt-2.5.7-1.2.el6.rf.x86_64.rpm from rpmforge: [Errno 256] No more mirrors to try.
  libmcrypt-devel-2.5.7-1.2.el6.rf.x86_64: failure: RPMS/libmcrypt-devel-2.5.7-1.2.el6.rf.x86_64.rpm from rpmforge: [Errno 256] No more mirrors to try.