My Quiet solar radio flux interpolations calculator has been broken recently, a result of changes at NOAA where they withdrew the observation data on which the calculator was based.
The data remains available on an FTP server, but my web server cannot access it for security reasons, and it would be unacceptably slow anyway.
I wrote to NOAA and they replied promptly:
You wrote to request restoring the 45day_rad.text and rad.txt to be accessible via HTTP. We are working to make a number of our products currently available only via FTP also available via our services at http://services.swpc.noaa.gov/text/. The files you’ve requested will be among those, but I do not yet have a schedule for the update.
As you can see, there is no time given for what ought to be a fairly trivial fix to restore availability under HTTP, albeit on a different URL.
In the mean time, I have implemented a temporary measure to take a snapshot of the FTP server’s file once per day (midday Sydney time) which should be up to date for the previous UTC day.
If you wish, you could email SWPC.Webmaster@noaa.gov thanking them for their service and encouraging them to restore the rad.txt and 45day_rad.txt files to HTTP access quickly.