The Modern Fortran site of @interkosmos (Philipp Engel) appears unreachable from my platforms.
https://cyber.dabamos.de/programming/modernfortran
Assuming it is actually down and not a quirk of my nodes I would be curious to know the status or if it moved and I missed it, etc.
There is an issue with the domain, Iām currently waiting for a letter from DENIC. The site will hopefully be reachable again in the next days. 
Good luck. I noticed that too as I wanted to forward it to someone as a resource for learning. Nice site, btw.
At least, a copy is available in the Internet Archive.
The website is online again.