Can you confirm that my setting is correct for what I want to do:
You've set Media Center to use Media Network. You have an Access Key. Authentication is off. If you enter that Access Key in JRemote, it should connect to Media Center.
If it doesn't, then something is blocking access on the server side. Firewall or ? There's no way we can tell you what it is.
... control MC pas J Remote installed on my smartphone.
I think you mean
control MC by using JRemote installed on my smartphone
That's what JRemote can do.
Investigate the server side problem.
I tried using your Access Key to connect to your server and I could not do it.
100.x.x.x (outside address)
192.168.1.146 (your local or "inside" address)
178.x.x.x (outside address)
Normally, I would expect just two addresses. One inside and one outside. So it's possible your network is misconfigured.
You can try using the inside network address instead of the Access Key.
Add Server > IP Address
Enter 192.1.146
Port is usually 52199