Cannot access ftp: site for fdlibm.tar

There are problems accessing the following link:

open/src/java.base/share/classes/java/lang/StrictMath.java: * href="ftp://ftp.netlib.org/fdlibm.tar">{@code fdlibm}</a>. These

On one browser, I get the response
The proxy could not connect to the destination in time. Please verify the site you are attempting to access and retry.

On another browser I get no response