I'm trying to update FC4T1 on a server at work, with a firewall and proxy in place, and I'm running into problems. When I run yum update or yum update somepackagename, I get the following error: yum update acl Setting up Update Process Setting up Repos 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 462, in doCommands return self.updatePkgs() File "/usr/share/yum-cli/cli.py", line 956, in updatePkgs self.doRepoSetup() File "/usr/share/yum-cli/cli.py", line 79, in doRepoSetup repo.baseurlSetup() File "repos.py", line 466, in baseurlSetup File "repos.py", line 718, in getMirrorList File "/usr/lib/python2.4/site-packages/urlgrabber/grabber.py", line 444, in urlopen return default_grabber.urlopen(url, **kwargs) File "/usr/lib/python2.4/site-packages/urlgrabber/grabber.py", line 575, in urlopen return self._retry(opts, retryfunc, url) File "/usr/lib/python2.4/site-packages/urlgrabber/grabber.py", line 547, in _retry return apply(func, (opts,) + args, {}) File "/usr/lib/python2.4/site-packages/urlgrabber/grabber.py", line 574, in retryfunc return URLGrabberFileObject(url, filename=None, opts=opts) File "/usr/lib/python2.4/site-packages/urlgrabber/grabber.py", line 727, in __init__ self._do_open() File "/usr/lib/python2.4/site-packages/urlgrabber/grabber.py", line 794, in _do_open fo, hdr = self._make_request(req, opener) File "/usr/lib/python2.4/site-packages/urlgrabber/grabber.py", line 885, in _make_request fo = opener.open(req) File "/usr/lib/python2.4/urllib2.py", line 358, in open response = self._open(req, data) File "/usr/lib/python2.4/urllib2.py", line 376, in _open '_open', req) File "/usr/lib/python2.4/urllib2.py", line 337, in _call_chain result = func(*args) File "/usr/lib/python2.4/urllib2.py", line 573, in <lambda> lambda r, proxy=url, type=type, meth=self.proxy_open: \ File "/usr/lib/python2.4/urllib2.py", line 580, in proxy_open if '@' in host: TypeError: iterable argument required I ran the export ftp_proxy=proxy.company.com:80 http_proxy=proxy.company.com:80 and https_proxy=proxy.company.com:80. I also setup the Redhat Network Configuration with Enable HTTP Proxy: proxy.company.com:80. Should I be using port 80 or is there some other reason this is failling?