Can't Update with mirror

[CarinaVB]

Hello everybody!!!
I Install the server and the console to make upgrades via internal http server (ESET Smart security Bussiness Edition), but the machine on which I create the mirror has no outlet to the Internet, do not work for me the mirror and hence no updates, how I can update manually without connecting to the Internet?
I tried the configuration in a net with internet and it works ok, but I can't connect this network to internet.

What I'm doing wrong?

[Marcos]

Offline updates are not possible, unfortunately. How many clients do you have in your network? Neither of them has Internet connection?