prob : connexion under console with ubuntu 9.04

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http://www.ubuntux.org – Hi ubuntu community, i'm glad to be among you, this is my first post here, and i would like to share some problems. i'm running ubuntu 9.04 in a virtual machine (VMware workstation6.5 ) under Windows 2000. The company where i'm working are using a "static Ip" , so i had to configure the IP adress, gateway, layer, DNS and the proxy. when i'm loading web pages it works fine, but when i want to register Nessus, under console of course, it gaves me this msg: ---------------------------------------------------- Could not resolve 'plugins.nessus.org' Could not resolve 'plugins.nessus.org' Could not open connection to plugins.nessus.org:443 ---------------------------------------------------- i figure that it's about https(443). but apt-get does not work as well. so i'm stuck. any ideas plz (Distributions)