How to solve this error message in RHEL4 ?

Issue

• User can not register system and meets below messages.

# rhn_register
   OpenSSL.SSL.Error
   Please check up2date message.

   /var/log/up2date
[Fri May 16 11:58:56 2014] up2date   File "/usr/share/rhn/up2date_client/gui.py", line 432, in onLoginPageNext
    ret = self.loginPageApply()
   File "/usr/share/rhn/up2date_client/rhnregGui.py", line 154, in loginPageApply
    self.getCaps()
   File "/usr/share/rhn/up2date_client/rhnregGui.py", line 98, in getCaps
    caps = rhnreg.getCaps()
   File "/usr/share/rhn/up2date_client/rhnreg.py", line 348, in getCaps
    rpcServer.doCall(s.registration.welcome_message)
   File "/usr/share/rhn/up2date_client/rpcServer.py", line 238, in doCall
    ret = apply(method, args, kwargs)
   File "/usr/lib64/python2.3/xmlrpclib.py", line 1029, in __call__
    return self.__send(self.__name, args)
   File "/usr/share/rhn/up2date_client/rpcServer.py", line 46, in _request1
    ret = self._request(methodname, params)
   File "/usr/lib/python2.3/site-packages/rhn/rpclib.py", line 326, in _request
    self._handler, request, verbose=self._verbose)
   File "/usr/lib/python2.3/site-packages/rhn/transports.py", line 172, in request
    headers, fd = req.send_http(host, handler)
   File "/usr/lib/python2.3/site-packages/rhn/transports.py", line 702, in send_http
    headers=self.headers)
   File "/usr/lib64/python2.3/httplib.py", line 718, in request
    self._send_request(method, url, body, headers)
   File "/usr/lib64/python2.3/httplib.py", line 739, in _send_request
    self.endheaders()
   File "/usr/lib64/python2.3/httplib.py", line 712, in endheaders
    self._send_output()
   File "/usr/lib64/python2.3/httplib.py", line 597, in _send_output
    self.send(msg)
   File "/usr/lib64/python2.3/httplib.py", line 576, in send
    self.sock.sendall(str)
   File "/usr/lib/python2.3/site-packages/rhn/SSL.py", line 216, in write
    sent = self._connection.send(data)