$ ./python -m test -v test_urllib2net -u all

...
test_ftp (test.test_urllib2net.OtherNetworkTests) ... skipped "Resource 'ftp://www.pythontest.net/README' is not available"
test_redirect_url_withfrag (test.test_urllib2net.OtherNetworkTests) ... ok
test_sites_no_connection_close (test.test_urllib2net.OtherNetworkTests) ... skipped 'XXX: http://www.imdb.com is gone'
test_urlwithfrag (test.test_urllib2net.OtherNetworkTests) ... ok
test_ftp_basic (test.test_urllib2net.TimeoutTest) ... skipped "Resource 'ftp://www.pythontest.net/' is not available"
test_ftp_default_timeout (test.test_urllib2net.TimeoutTest) ... skipped "Resource 'ftp://www.pythontest.net/' is not available"
test_ftp_no_timeout (test.test_urllib2net.TimeoutTest) ... ERROR
test_ftp_timeout (test.test_urllib2net.TimeoutTest) ... ERROR
...

ERROR: test_ftp_no_timeout (test.test_urllib2net.TimeoutTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/vstinner/prog/python/master/Lib/urllib/request.py", line 1540, in ftp_open
    fp, retrlen = fw.retrfile(file, type)
  File "/home/vstinner/prog/python/master/Lib/urllib/request.py", line 2425, in retrfile
    conn, retrlen = self.ftp.ntransfercmd(cmd)
  File "/home/vstinner/prog/python/master/Lib/ftplib.py", line 359, in ntransfercmd
    host, port = self.makepasv()
  File "/home/vstinner/prog/python/master/Lib/ftplib.py", line 337, in makepasv
    host, port = parse227(self.sendcmd('PASV'))
  File "/home/vstinner/prog/python/master/Lib/ftplib.py", line 273, in sendcmd
    return self.getresp()
  File "/home/vstinner/prog/python/master/Lib/ftplib.py", line 246, in getresp
    raise error_perm(resp)
ftplib.error_perm: 500 OOPS: vsf_sysutil_bind

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/vstinner/prog/python/master/Lib/test/test_urllib2net.py", line 327, in test_ftp_no_timeout
    u = _urlopen_with_retry(self.FTP_HOST, timeout=None)
  File "/home/vstinner/prog/python/master/Lib/test/test_urllib2net.py", line 27, in wrapped
    return _retry_thrice(func, exc, *args, **kwargs)
  File "/home/vstinner/prog/python/master/Lib/test/test_urllib2net.py", line 23, in _retry_thrice
    raise last_exc
  File "/home/vstinner/prog/python/master/Lib/test/test_urllib2net.py", line 19, in _retry_thrice
    return func(*args, **kwargs)
  File "/home/vstinner/prog/python/master/Lib/urllib/request.py", line 222, in urlopen
    return opener.open(url, data, timeout)
  File "/home/vstinner/prog/python/master/Lib/urllib/request.py", line 525, in open
    response = self._open(req, data)
  File "/home/vstinner/prog/python/master/Lib/urllib/request.py", line 542, in _open
    result = self._call_chain(self.handle_open, protocol, protocol +
  File "/home/vstinner/prog/python/master/Lib/urllib/request.py", line 503, in _call_chain
    result = func(*args)
  File "/home/vstinner/prog/python/master/Lib/urllib/request.py", line 1551, in ftp_open
    raise exc.with_traceback(sys.exc_info()[2])
  File "/home/vstinner/prog/python/master/Lib/urllib/request.py", line 1540, in ftp_open
    fp, retrlen = fw.retrfile(file, type)
  File "/home/vstinner/prog/python/master/Lib/urllib/request.py", line 2425, in retrfile
    conn, retrlen = self.ftp.ntransfercmd(cmd)
  File "/home/vstinner/prog/python/master/Lib/ftplib.py", line 359, in ntransfercmd
    host, port = self.makepasv()
  File "/home/vstinner/prog/python/master/Lib/ftplib.py", line 337, in makepasv
    host, port = parse227(self.sendcmd('PASV'))
  File "/home/vstinner/prog/python/master/Lib/ftplib.py", line 273, in sendcmd
    return self.getresp()
  File "/home/vstinner/prog/python/master/Lib/ftplib.py", line 246, in getresp
    raise error_perm(resp)
urllib.error.URLError: <urlopen error ftp error: error_perm('500 OOPS: vsf_sysutil_bind')>