To configure a system to use a proxy server when accessing ULN, update the proxy configuration settings in /etc/sysconfig/rhn/up2date.

• Edit /etc/sysconfig/rhn/up2date and add the enableProxy and httpProxy configuration variables as required.

  enableProxy=1
  httpProxy=http://proxysvr.example.com:3128

  If the proxy server requires authentication, also specify the enableProxyAuth, proxyUser, and proxyPassword settings.

  enableProxy=1
  httpProxy=http://proxysvr.example.com:3128
  enableProxyAuth=1
  proxyUser=user
  proxyPassword=password   

  Caution:

  All dnf users require read access to /etc/dnf/dnf.conf or /etc/sysconfig/rhn/up2date. If these files must be world-readable, don't use a proxy password that's the same as any user's system password, and especially not the root user password.