Can't fetch boost-jam

[Open Slate]

For several days I have not been able to update my ports due to fetch
errors. Right now the first port portupgrade wants to update is
devel/boost-jam. Here is the tail of the output of make issued in
/usr/ports/devel/boost-jam:

=> Attempting to fetch
http://netcologne.dl.sourceforge.net/project/boost/boost/1.52.0/boost_1_52_0.tar.bz2
fetch:
http://netcologne.dl.sourceforge.net/project/boost/boost/1.52.0/boost_1_52_0.tar.bz2:
Forbidden
=> Attempting to fetch
http://ignum.dl.sourceforge.net/project/boost/boost/1.52.0/boost_1_52_0.tar.bz2
fetch:
http://ignum.dl.sourceforge.net/project/boost/boost/1.52.0/boost_1_52_0.tar.bz2:
Forbidden
=> Attempting to fetch
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/distfiles/boost_1_52_0.tar.bz2
fetch:
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/distfiles/boost_1_52_0.tar.bz2:
File unavailable (e.g., file not found, no access)
=> Couldn't fetch it - please try to retrieve this
=> port manually into /usr/ports/distfiles/ and try again.
*** [do-fetch] Error code 1

Stop in /usr/ports/devel/boost-jam.

I can connect to the ftp server manually:

$ ftp ftp.FreeBSD.org
Trying 204.152.184.73:21 ...
Connected to ftp.FreeBSD.org.
220 Welcome to freebsd.isc.org.
Name (ftp.FreeBSD.org:gary):

dir of the distfiles directory:

ftp> dir boost*
229 Entering Extended Passive Mode (|||47008|)
150 Here comes the directory listing.
-rw-r--r--    1 967      100       1430115 Oct 01  2007
boost-build-2.0-m12.tar.bz2
-rw-r--r--    1 967      100      29435646 Nov 02  2008 boost_1_37_0.tar.bz2
-rw-r--r--    1 967      100      29408537 May 01  2009 boost_1_39_0.tar.bz2
-rw-r--r--    1 967      100      33348161 Nov 17  2009 boost_1_41_0.tar.bz2
-rw-r--r--    1 967      100      33892438 May 04  2010 boost_1_43_0.tar.bz2
-rw-r--r--    1 967      100      39330184 Nov 17  2010 boost_1_45_0.tar.bz2
-rw-r--r--    1 967      100      42001335 Mar 12  2011 boost_1_46_1.tar.bz2
-rw-r--r--    1 967      100      48236989 Nov 15  2011 boost_1_48_0.tar.bz2
226 Directory send OK.


>From uname;
9.1-RELEASE FreeBSD 9.1-RELEASE #0 r243826: Tue Dec  4 06:55:39 UTC
2012     root at obrian.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  i386

How can I fix this?
-- 
Gary Dunn
Open Slate Project
http://openslate.org/