Ubuntu :: 10.04 - VPN Connection Fails Over Wireless

I am using Ubuntu 10.04 64bit but so far all attempts to connecting over wireless give the same end result "VPN Connection Failed" from the [URL] at the end of the page as a link to a blog [URL] first problem is I can't restart network manager

Code:
sudo /etc/init.d/NetworkManager restart
return command not found, but if I use this
Code:
sudo service network-manager restart
works, maybe the problem of this connection is because I attempt over wireless.