And that smells like a "IP Address Conflict" issue.
Here are some points
You can not change the IP address of a Hughes modem. It is hardwired at 192.168.0.1:
You CANNOT do a remote LAN IP address change on a router without losing the connection when the change is put into effect.
There are TON of NIC adaptor settings that will affect performance.
There are SEVERAL tons of router settings that will affect performance.
System baseline performance levels need to be established with a single computer connected directly to the Hughes modem.
Hughes, with the exception of a single Dlink router (if ordered and installed at time of service inception) does not provide detailed "Networking" support.
Hughes is your ISP, not your personal IT Department.
If networking support is needed it can be had here in the Community but there is simply too many variables for Hughes to give detailed support for every switch, router and access point by however many manufactures, models and versions since the dawn of time.
Time for some screenshots of key settings of the NIC and the router.
Is it possible for there to be a conflict when trying to reach the SCC if the IP address is set to the same for the router? Might the OP have better luck trying to use http://systemcontrolcenter.com/ instead? I'm just speculating.
Thanks for the info. The OP definitely needs to try it without the router. Hopefully he/she will take the advice and do so, otherwise the problem may never be solved.