If you are behind a proxy server you can follow the following steps to do a zypper upgrade on your vicibox server.
1.create a .bashrc file under /root and add the following lines in it
cd /root
vim .bashrc
"Type the following lines"
function proxy(){
export http_proxy="http://proxy.username:proxypassword@proxyipaddress:portnumber"
export ftp_proxy="http://proxy.username:proxypassword@proxyipaddress:portnumber"
}
save file .bashrc
2.Logout from terminal and login again as root (since .bashrc scripts are logon scripts)
3.Type "proxy" at the # prompt and hit enter
4.Test the internet connection by "wget google.com" , if an index.html file is saved you are good to go
5.Now you can zypper up
This worked for me , thought it may help who may be in similar network scenario