FWIW, there *is* an HTTP server running there, but it drops the connection
as soon as the request line is completed:
tim@otis ~ $ telnet hg.netbeans.org 80
Trying 137.254.60.37...
Connected to hg.netbeans.org.
Escape character is '^]'.
GET / HTTP/1.1
Connection closed by foreign host.
Hey Oracle people,
if I'm not mistaken hg.netbeans.org is still hosted by oracle. Could
you please contact your infrastructure people to see why
hg.netbeans.org rejects connections?
For example this download should succeed: