Nightly linux updates, ie yum-cron, doesn't work. I run CentOS 5.

Is everything set up properly? Check the following
  1. # chkconfig --list|grep yum-cron
  2. # /etc/init.d/yum-cron restart
  3. # chkconfig --list|grep sendmail
  4. # chkconfig sendmail on
  5. # /etc/init.d/sendmail restart
  6. # vi /etc/hosts.allow
  7. Make sure these two lines are present in hosts.allow;
    1. ALL: 127.0.0.1
    2. sendmail: localhost

If it still fails, contakt the linux admin!

Also see Yum-cron settings.

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