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Description of problem:
today I entered the command:

  $ up2date --whatprovides=sendmail-cf

It connected to a mirror didn't work and the connection was refused. 
Instead of handling this error (as any network client should do) it
crashed ans spit out a stack trace.



Version-Release number of selected component (if applicable):
up2date-4.3.19-1

How reproducible:
Sometimes

Steps to Reproduce:
1.  up2date --whatprovides=sendmail-cf
2.  retry a until mirror.eas.muohio.edu is selected (or any other
non-working mirror)

Actual Results:  $ up2date --whatprovides=sendmail-cf
http://fedora.redhat.com/download/up2date-mirrors/fedora-core-2
using mirror: http://mirror.eas.muohio.edu/fedora/linux/core/2/i386/os/
http://fedora.redhat.com/download/up2date-mirrors/updates-released-fc2
using mirror: http://rpmfind.net/linux/fedora/core/updates/2/i386/
Traceback (most recent call last):
  File "/usr/sbin/up2date", line 1271, in ?
    sys.exit(main() or 0)
  File "/usr/sbin/up2date", line 704, in main
    return whatprovides(cfg["depslist"])
  File "/usr/sbin/up2date", line 941, in whatprovides
    availlist = rhnPackageInfo.getAvailablePackageList()
  File "/usr/share/rhn/up2date_client/rhnPackageInfo.py", line 219, in
getAvailablePackageList
    package_list = availablePackageList(
  File "/usr/share/rhn/up2date_client/rhnPackageInfo.py", line 153, in
availablePackageList
    progressCallback = progressCallback)
  File "/usr/share/rhn/up2date_client/rpcServer.py", line 112, in doCall
    ret = apply(method, args, kwargs)
  File "/usr/share/rhn/up2date_client/repoDirector.py", line 20, in
listPackages
    return self.handlers[channel['type']].listPackages(channel,
msgCallback, progressCallback)
  File "/usr/share/rhn/up2date_client/rpmSource.py", line 226, in
listPackages
    msgCallback, progressCallback)
  File "/usr/share/rhn/up2date_client/repoBackends/yumRepo.py", line
201, in listPackages
    agent = "Up2date %s/Yum" % up2dateUtils.version())
  File "/usr/share/rhn/up2date_client/repoBackends/urlUtils.py", line
324, in fetchUrl
    endRange=end)
  File "/usr/share/rhn/up2date_client/repoBackends/urlUtils.py", line
117, in open_resource
    return opener.open(request)
  File "/usr/lib/python2.3/urllib2.py", line 326, in open
    '_open', req)
  File "/usr/lib/python2.3/urllib2.py", line 306, in _call_chain
    result = func(*args)
  File "/usr/lib/python2.3/urllib2.py", line 901, in http_open
    return self.do_open(httplib.HTTP, req)
  File "/usr/lib/python2.3/urllib2.py", line 886, in do_open
    raise URLError(err)
urllib2.URLError: <urlopen error (111, 'Connection refused')>


Expected Results:  (1)  If the mirror was available, obviously this
should have succeeded.
(2)  If the connection was refused, *at a minimum* it should catch
this error and print a useful error message.  Simply crashing is not
reasonable behavior for a network client.
(3)  Even better, why doesn't it retry on a different mirror?

Additional info:

I often find that up2date fails when mirror.eas.muohio.edu is
selected.  Why is this non-working mirror provided to up2date?