Address resolution problem with bzr-git

[Eli Zaretskii]

This strange problem happens only on one machine out of 3 I tried.
The other work with this repository with no connectivity problems.

  D:\usr\eli\bzr>bzr branch http://git.gnus.org/gnus.git
  bzr: ERROR: Connection error: Couldn't resolve host 'git.gnus.org' [Errno 11001] getaddrinfo failed

I thought that some firewall somewhere blocks something, but another
machine on the same network doesn't have this problem.  Restarting
didn't help, either.

Strangely, .bzr.log seems to indicate that bzr invoked the svn plugin,
see below.

A Web browser has no problems getting to this address on the same
machine which shows this error.

What can I do to debug and solve this problem?

TIA

  7.156  Traceback (most recent call last):
    File "bzrlib\commands.pyo", line 946, in exception_to_return_code
    File "bzrlib\commands.pyo", line 1150, in run_bzr
    File "bzrlib\commands.pyo", line 699, in run_argv_aliases
    File "bzrlib\commands.pyo", line 721, in run
    File "bzrlib\cleanup.pyo", line 135, in run_simple
    File "bzrlib\cleanup.pyo", line 165, in _do_with_cleanups
    File "bzrlib\builtins.pyo", line 1263, in run
    File "bzrlib\bzrdir.pyo", line 918, in open_tree_or_branch
    File "bzrlib\bzrdir.pyo", line 828, in open
    File "bzrlib\bzrdir.pyo", line 858, in open_from_transport
    File "bzrlib\lazy_import.pyo", line 129, in __call__
    File "bzrlib\transport\__init__.pyo", line 1690, in do_catching_redirections
    File "bzrlib\bzrdir.pyo", line 845, in find_format
    File "bzrlib\controldir.pyo", line 749, in find_format
    File "C:/Program Files/Bazaar/plugins\svn\__init__.py", line 259, in probe_transport
    File "C:/Program Files/Bazaar/plugins\svn\__init__.py", line 182, in dav_options
    File "bzrlib\transport\http\_urllib.pyo", line 79, in _perform
    File "urllib2.pyo", line 391, in open
    File "urllib2.pyo", line 409, in _open
    File "urllib2.pyo", line 369, in _call_chain
    File "bzrlib\transport\http\_urllib2_wrappers.pyo", line 722, in http_open
    File "bzrlib\transport\http\_urllib2_wrappers.pyo", line 666, in do_open
    File "bzrlib\transport\http\_urllib2_wrappers.pyo", line 561, in retry_or_raise
  ConnectionError: Connection error: Couldn't resolve host 'git.gnus.org' [Errno 11001] getaddrinfo failed