Why does the Red Hat Update Agent return the error “No Route to Host”?
The system you are running it on is not connected to the Internet, or the system is attempting to access Red Hat Network through a proxy server. Proxy server settings can be configured in the newest version of up2date available at http://www.redhat.com/support/errata/RHBA-2000-138.html. For instructions on configuring the proxy server, refer to the section called General Settings in Chapter 3.