There is a new bug in HN, posting a trailing slash on an URL gives /.
Remove the trailing slash and your link works.
Re:GNUnet
by simcop2387 on Saturday June 08, 2013 @08:03PM
(#5846834)
Disregard this, i'm just curious
You can add # which seems to make it ignore the trailing slash:
Fixed link: http://retroshare.sourceforge.net
http://retroshare.sourceforge.net/