Can't connect to ME3 servers

Hello folks,

At first, I have been playing ME3 on my old PC at my office (I'm the boss !). No PB.

Then my new PC arrived. I settled Origin then downloaded ME3 on W7 pro. When I launched my game ; while checking downloadable contents a message saying something like  "ME3 server is unavailable, try again later" appeared.

I also could'nt reach ME3 servers on my old PC.

I renewed the installation of Origin, as I was told. I checked the firewall. I checked the TCP and UDP ports. Restarted my box. No way.

I noticed that back home on my old PC, I could reach ME3 and play normally.

I also noticed that my access to another boardgame server on my new PC at my office was blocked.

Is it W7's fault, or my connection's ?

Any clue ?

Thanks in advance.