Sorry to take a while to respond. I did not want to waste your time and so I have been spending a lot of time trying to figure this out by testing all sorts of configurations.
Resetting the DNS settings was a good idea. I was not doing that, and that probably explains the intermittent results I was getting.
I have tested 3 different computers and 2 browsers (IE and Firefox) but I still get the same results.
One computer is an old Pentium 3 laptop that only has Windows Defender as antivirus, and the standard Windows XP firewall. I get the same result with that laptop: Firefox gives me the message: “Firefox can’t find the server at www.goes.noaa.gov”
I even tried bypassing my router and connecting directly to my DSL modem. No luck.
It is possible that I installed some other antivirus/anti-malware software on that laptop–it’s been so long since I’ve used it I’m not sure. Nothing is listed in Program Files, so I would need to search the registry and I’ve not had the time.
I tested http://radar.weather.gov yesterday numerous times with intermittent success. Today, the site loads properly each time. Could this simply be a case of server overload due to the bad weather the USA has been experiencing?
Yes, I can confirm the problem. I switched to my ISP’s DNS servers for a couple days and had no issues with http://radar.weather.gov. Now, after going back to Comodo Secure DNS the page is mostly unavailable.