When attempting to upload a disk image directly, I get a 'network error'

Issue

• When attempting to upload a disk directly, I get the following error:

Unable to upload image to disk <DISK-ID> due to a network error. Make sure ovirt-imageio-proxy service is installed and configured, and ovirt-engine's certificate is registered as a valid CA in the browser.

• In the messages file on the manager, we see:

ovirt-imageio-proxy: <client-IP> - - [27/Oct/2016 10:36:39] "OPTIONS /images/13dea932-3c8a-4344-a502-4f307c234ed6 HTTP/1.1" 204 0
journal: ovirt-imageio-proxy root ERROR Failed communicating with vdsm-imaged: An SSL error occurred.#012Traceback (most recent call last):#012  File "/usr/lib/python2.7/site-packages/ovirt_imageio_proxy/image_handler.py", line 177, in make_imaged_request#012    timeout=timeout, stream=stream)#012  File "/usr/lib/python2.7/site-packages/requests/sessions.py", line 576, in send#012    r = adapter.send(request, **kwargs)#012  File "/usr/lib/python2.7/site-packages/requests/adapters.py", line 431, in send#012    raise SSLError(e, request=request)#012SSLError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:765)

• In RHV 4.4+ the ssl error is present within /var/log/ovirt-imageio/daemon.log on the RHV Manager:

Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/ovirt_imageio/_internal/http.py", line 774, in __call__
    self.dispatch(req, resp)
  File "/usr/lib64/python3.6/site-packages/ovirt_imageio/_internal/http.py", line 819, in dispatch
    return method(req, resp, *match.groups())
  File "/usr/lib64/python3.6/site-packages/ovirt_imageio/_internal/cors.py", line 84, in wrapper
    return func(self, req, resp, *args)
  File "/usr/lib64/python3.6/site-packages/ovirt_imageio/_internal/images.py", line 246, in options
    ctx = backends.get(req, ticket, self.config)
  File "/usr/lib64/python3.6/site-packages/ovirt_imageio/_internal/backends/__init__    cafile=ca_file)
.py", line 85, in get
  File "/usr/lib64/python3.6/site-packages/ovirt_imageio/_internal/backends/http.py", line 48, in open
    return Backend(url, **options)
  File "/usr/lib64/python3.6/site-packages/ovirt_imageio/_internal/backends/http.py", line 76, in __init__
    self._connect()
  File "/usr/lib64/python3.6/site-packages/ovirt_imageio/_internal/backends/http.py", line 117, in _connect
    self._con = self._create_tcp_connection()
  File "/usr/lib64/python3.6/site-packages/ovirt_imageio/_internal/backends/http.py", line 379, in _create_tcp_connection
    con.connect()
  File "/usr/lib64/python3.6/http/client.py", line 1422, in connect
    server_hostname=server_hostname)
  File "/usr/lib64/python3.6/ssl.py", line 365, in wrap_socket
    _context=self, _session=session)
  File "/usr/lib64/python3.6/ssl.py", line 776, in __init__
    self.do_handshake()
  File "/usr/lib64/python3.6/ssl.py", line 1036, in do_handshake
    self._sslobj.do_handshake()
  File "/usr/lib64/python3.6/ssl.py", line 648, in do_handshake
    self._sslobj.do_handshake()
ssl.SSLError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:897)