Which servers do up2date and yum contact to update my system?
Updated -
Some networks require access to external servers to be explicitly defined for security purposes. Restricted proxy servers or firewalls, for example, can be configured to allow access to RHN servers for automatic updating with up2date or yum update. This makes it unnecessary to store passwords or other authentication information in RHN configuration files...
Subscriber exclusive content
A Red Hat subscription provides unlimited access to our knowledgebase, tools, and much more.