In order to use one ePO server as the source for another, you need to export the master repository public key from the first server and import it into the second. This is described in the Product Guide - I'm not sure which version of ePO you have but they are all on the download site.
However, please note: it is a very bad idea to point one ePO server at the master repository of another, as you run the risk of importing one server's agent package into the other, which can have disastrous consequences. We very strongly recommend instead that you create a distributed repository on the first ePO server, and configure it so that it only contains the content that you want - usually DATs, engines, HIPs updates and so on - and then use this DR as the source for the second ePO server.
Thanks for this quick answer.
Yes i would like to use a distributed repository. You could see my config below.
It doesn't work and the port 80 is open between my server. When i browse my site http://10.2.3.3 i have this result :
26/04/2013 01:05 catalog.z
26/04/2013 01:05 <dir>Current
26/04/2013 01:05 Replica.log
26/04/2013 01:05 SiteStat.xml
I don't know why i need this UNC path and this credential below. I want to use only port 80.
What is the goal of credential ? what sort of account is expected ?
This is for configuring an HTTP distributed repository - the ePO server replicates the files using UNC, and the client machines download using HTTP. So you need to configure a UNC share in the web server's folder structure, and provide credentials that have write access to it, in order to be able to copy the files to it. Please see the Product Guide section on configuring distributed repositories - it explains this well