When starting a parallel-all-tests run on master to verify some configuration changes on upstream Jenkins, all builds broke in the setup phase, because they were unable to download maven. E.g. in ubuntu-16.04-buil-only:
The URL used in the script looked dead in my browser too.
Navigating the Apache download pages manually yields the following URL for the same Maven version:
The bootstrap scripts have a similar download statement for Ant as well, which is broken in the same way. Replacement URL is similar: