What Hughes modem do you have ? (HN9000, HT1000/1100)
Are all 5 LED's illuminated on the front of the modem?
Open the Modems internal SCC (System Control Center) by entering 192.168.0.1 into your browsers address bar.
That will open a page like this (HT1100)
(click on picture for larger image)
Are both of the icons marked as numbers one and two both green ?
If you post a screenshot be sure to edit out your SAN ... starts with the letters DSS.