redhat5.3图形界面的software updater不能使用

提示如下：
Component: pirut
Summary: TB3518121c rpcServer.py:168:getServer:SSLCertificateFileNotFound: ERROR: can not find RHNS CA file: /usr/share/rhn/RHN-ORG-TRUSTED-SSL-CERT

Traceback (most recent call last):
File "/usr/sbin/pup", line 617, in ?
main()
File "/usr/sbin/pup", line 609, in main
pup = PackageUpdater(not options.autoapply, options.config)
File "/usr/sbin/pup", line 84, in __init__
GraphicalYumBase.__init__(self, False, config)
File "/usr/lib/python2.4/site-packages/pirut/__init__.py", line 137, in __init__
plugin_types=(yum.plugins.TYPE_CORE,))
File "/usr/lib/python2.4/site-packages/yum/__init__.py", line 139, in doConfigSetup
errorlevel=errorlevel)
File "/usr/lib/python2.4/site-packages/yum/__init__.py", line 205, in _getConfig
self.plugins.run('init')
File "/usr/lib/python2.4/site-packages/yum/plugins.py", line 176, in run
func(conduitcls(self, self.base, conf, **kwargs))
File "/usr/lib/yum-plugins/rhnplugin.py", line 110, in init_hook
login_info = up2dateAuth.getLoginInfo()
File "/usr/share/rhn/up2date_client/up2dateAuth.py", line 217, in getLoginInfo
login()
File "/usr/share/rhn/up2date_client/up2dateAuth.py", line 168, in login
server = rhnserver.RhnServer()
File "/usr/share/rhn/up2date_client/rhnserver.py", line 149, in __init__
self._server = rpcServer.getServer()
File "/usr/share/rhn/up2date_client/rpcServer.py", line 168, in getServer
raise up2dateErrors.SSLCertificateFileNotFound(msg)
SSLCertificateFileNotFound: ERROR: can not find RHNS CA file: /usr/share/rhn/RHN-ORG-TRUSTED-SSL-CERT

Local variables in innermost frame:
lang: en_US
rhns_ca_cert: /usr/share/rhn/RHN-ORG-TRUSTED-SSL-CERT
log:
proxyUser: None
cfg:
ca: ['/usr/share/rhn/RHN-ORG-TRUSTED-SSL-CERT']
rhns_ca_certs: ['/usr/share/rhn/RHN-ORG-TRUSTED-SSL-CERT']
proxyPassword: None
proxyHost: None
s:
refreshCallback: None
serverUrls: ['https:///XMLRPC']
env: LANG
msg: ERROR: can not find RHNS CA file: /usr/share/rhn/RHN-ORG-TRUSTED-SSL-CERT
serverList:
不能使用图形界面进行包安装