I don't know if this would make a difference, but it might be worth it to try an alternate DNS, like Google's.
I don't think it's them. As you may have seen, Fox12 can get to the site just fine, using the same ISP, so it's not an ISP issue. @GabeU suggested changing DNS, but you may also want to try clearing the DNS in your system. Here's the procedure:
1. Turn off all of the devices using the modem directly or via wifi (all phones, iPads, computers, etc.)
2. Unplug the modem's power from the wall socket.
3. Wait a minute, then plug the modem back in.
4. After all the lights on the modem are back on, wait an extra 5 minutes, then turn all your devices on one-by-one
5. Try the site again.
EDIT: I ran a traceroute and the request dead ends in LA due to what appears to be a dead CenturyLink server. Changing your DNS using the procedure above may reroute the request around the dead server (which is not a HughesNet server).
Mike, it's not a HughesNet issue. Running a tracert shows that the problem is with a CenturyLink server in LA, not with HughesNet. When you use a VPN you bypass that server.
Good morning folks,
Thank you for sharing your findings. I've escalated this internally to management and they have our network infrastructure team investigating. I'll post back once I have any news to share.
Your patience and understanding are much appreciated.
Thank you for your patience while our engineers investigate. Hughes has identified that the Treasury Direct website claims to support IPv6, but is not configured correctly. Since HughesNet does use IPv6 where possible, connection attempts are failing. Using a provider or VPN that does not support IPv6 will automatically use IPv4 and is likely to work. Hughes is working on a workaround so that customers attempting to reach this site automatically fall back to IPv4 and has alerted the website developer to the issue. Independent tests such as https://ipv6-test.com/validate.php and https://ready.chair6.net can be used to verify the web server's misconfiguration.
As maratsade pointed out, using a proxy like hide.me can be used to access the site, and alternatively you can reboot your PC to try accessing the site.
Once I have any other news to share, I'll post back.
This problem occurred before and there are other questions about it if you search. Hughes must have fixed the problem before. I asked about the problem in 2018 if I remember right. Now it came back on two of my computers but one works OK.