How to change the url of the server

Hi everybody,

thanks in advance for you time and attention ;-)

I'm setting up a demo small infrastructure of AppCenter 4.1 on a Centos 5.4. 

I can download and install the agent on my test android device thru internet, but I get the error message :"an error happened. Unable to connect to the server" on the client 

I opened the apk file (asset\policy.json) and see that he tries to connect to a wrong url : localhost. (that's what understand)

Do you know where I can set the external url to change the server ? 

I hope I'm clear enough.

Thanks for any help

Patrick