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User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.8) Gecko/20050524 Fedora/1.0.4-4 Firefox/1.0.4

Description of problem:
When I run yum update, it sometimes fail with an IndexError: list index out of range. I think it errors when trying to locate a mirror server. It doesn't happen every time though.

This is on a newly installed FC4 system. I'm also behind a proxy server. The proxy server needs authentication. 

Version-Release number of selected component (if applicable):
yum-2.3.2-7

How reproducible:
Sometimes

Steps to Reproduce:
I executed the following command as root:

1. export http_proxy=http://username:password@proxy.example.com:3128/ (not actual user/password/proxy names)
2. yum update
3.
  

Actual Results:  Sometimes yum runs successfully but most of the time it generates a traceback. The error is always an IndexError: list index out of range. 

Expected Results:  yum should run successfully without generating a traceback.

Additional info:

Traceback (most recent call last):
  File "/usr/bin/yum", line 15, in ?
    yummain.main(sys.argv[1:])
  File "/usr/share/yum-cli/yummain.py", line 72, in main
    result, resultmsgs = do()
  File "/usr/share/yum-cli/cli.py", line 419, in doCommands
    return self.updatePkgs()
  File "/usr/share/yum-cli/cli.py", line 877, in updatePkgs
    self.doRepoSetup()
  File "/usr/share/yum-cli/cli.py", line 78, in doRepoSetup
    self.doSackSetup(thisrepo=thisrepo)
  File "__init__.py", line 241, in doSackSetup
  File "repos.py", line 281, in populateSack
  File "repos.py", line 726, in getPrimaryXML
  File "repos.py", line 713, in _retrieveMD
  File "repos.py", line 605, in get
  File "/usr/lib/python2.4/site-packages/urlgrabber/mirror.py", line 414, in urlgrab
    return self._mirror_try(func, url, kw)
  File "/usr/lib/python2.4/site-packages/urlgrabber/mirror.py", line 392, in _mirror_try
    mirrorchoice = self._get_mirror(gr)
  File "/usr/lib/python2.4/site-packages/urlgrabber/mirror.py", line 290, in _get_mirror
    return gr.mirrors[gr._next]
IndexError: list index out of range
[root@tungsten tmp]# rpm -q yum
yum-2.3.2-7
[root@tungsten tmp]# rpm -q sqlite
sqlite-3.1.2-3
[root@tungsten tmp]# rpm -q python
python-2.4.1-2
[root@tungsten tmp]# rpm -q python-sqlite
python-sqlite-1.1.6-1
[root@tungsten tmp]# uname -a
Linux tungsten.hq.ntsp.nec.co.jp 2.6.12-1.1390_FC4 #1 Tue Jul 5 19:58:55 EDT 2005 i686 i686 i386 GNU/Linux