Some site down allows to open website via a IP address. So use FQDN i.e. domain name such as google.com
Type following for proxy server
Code:
export http_proxy=http://proxy_server:port/
export http_proxy=http://192.168.1.254:3128/
If proxy server uses user and password, try
Code:
wget --proxy-user=USERNAME --proxy-password=PASSWORD http://google.com/