Yes, it's required. Can you get to this URL from your web browser:
You should try running maven with -X to see if that indicates why maven can't seem to reach the above site.
The site is there, but nothing in the directory right now. Any alternatives?
The 184.108.40.206 release has a fix for this. You can use that release, or manually edit your 5.3 POM to change to the new name (220.127.116.11-fuse)
here are the two places you would need to make the change (these excerpts come from a 18.104.22.168 POM file)
And, here's a link to the fuse release: