Fetch of xz distfile fails - connection timeout()

[richard@…]

expected results: latest version of xz, 5.0.5, retrievable from ​http://tukaani.org/xz/

actual results: as per macports log file, fetch fails due to connect() timeout on all mirrors.

thus, any package depending on xz (e.g., gtk2) fails to download.

===================================
pertinent log file contents:

...
:debug:fetch Fetching distfile failed: connect() timed out!
:notice:fetch --->  Attempting to fetch xz-5.0.5.tar.bz2 from http://tukaani.org/xz/
:debug:fetch Fetching distfile failed: connect() timed out!
:notice:fetch --->  Attempting to fetch xz-5.0.5.tar.bz2 from http://svn.macports.org/repository/macports/distfiles/xz
:debug:fetch Fetching distfile failed: connect() timed out!
:error:fetch org.macports.fetch for port xz returned: fetch failed
...

===================================

however, when executing curl from the command line, this output:

===================================

IT-MacBookPro:~ central$ curl -v http://tukaani.org/xz/xz-5.0.5.tar.bz2 >xz.tar.bz2
* About to connect() to tukaani.org port 80 (#0)
*   Trying 84.34.147.45...
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0* connected
* Connected to tukaani.org (84.34.147.45) port 80 (#0)
> GET /xz/xz-5.0.5.tar.bz2 HTTP/1.1
> User-Agent: curl/7.24.0 (x86_64-apple-darwin12.0) libcurl/7.24.0 OpenSSL/0.9.8r zlib/1.2.5
> Host: tukaani.org
> Accept: */*
> 
< HTTP/1.1 200 OK
< Date: Tue, 06 Aug 2013 19:57:03 GMT
< Server: Apache/2
< Last-Modified: Sun, 30 Jun 2013 16:47:09 GMT
< ETag: "12dec08-102f29-4e061dce09d40"
< Accept-Ranges: bytes
< Content-Length: 1060649
< Content-Type: application/x-bzip2
< 
{ [data not shown]
100 1035k  100 1035k    0     0   332k      0  0:00:03  0:00:03 --:--:--  417k
* Connection #0 to host tukaani.org left intact
* Closing connection #0
IT-MacBookPro:~ central$

===================================