Our sys admin has set up a load-balancer that handles all HTTPS requests and proxies them to the server as HTTP. The server doesn't have HTTPS so the connection between LB and server is un-secure but the connection to the LB is.
I'd never seen something like that and I am not really sure it's the proper way to do it.
The actual server is not available publicly, only through the load-balancer. 

* Is this enough to make it secure? Could one bypass the load-balancer?
* Is this a standard technique?