You already advise me to make a try with Firewall turned off. I did. I couldn't get connected either, I have try this connection ±15mn, hope it was enough for a test.
Yes, am connecting at home and honestly I couldn't answer to your question: modem is Dash2, I though it was used for the connection, but you seems not so sure of it...
The provider have installed a box next the antenne on the roof at 16m. high (no easy to check)
I must contact him again, maybe He will found something wrong there ?...
I will let you know...