Created attachment 1103036 [details]
Screenshot

Description of problem:
when input an invalid Engine FQDN  address to register rhevm, the ovirt-node.log and reister.log file show Traceback info.

Version-Release number of selected component (if applicable):
rhev-hypervisor7-7.2-20151201.2
ovirt-node-plugin-vdsm-0.6.1-4.el7ev.noarch

How reproducible:
100%
QA Whiteboard: TUI

Steps to Reproduce:
 1. TUI clean install rhev-hypervisor7-7.2-20151201.2 successful with no error.
 2. IN ‘Network‘ Page，Enable NIC via DHCP and enable SSH.
 3. In ‘RHEV-M’ page ，Input an invalid Engine FQDN  address.
 4. Click ‘Save’.

Test result:
After step4, output some message:

Transaction: Configuring RHEV-M                                                             │                                                                                                                                                                               Checking pre-conditions ...                                                                 │
│(1/1) Registering oVirt Node...                                                             │
│                                                                                            │
│An error occurred while applying the changes:                                               │
│Cannot register the node into 10.66.10.238!                                                 │
│Connection refused to 10.66.10.238                                                          │
│Full log: /var/log/vdsm/register.log


Additional info:
#ovirt-node.log
<snip>
2015-12-02 02:27:07,974       INFO Current page is 'RHEV-M'
2015-12-02 02:27:11,274    WARNING No widget for path action.register
2015-12-02 02:27:11,275    WARNING No widget for path action.register
2015-12-02 02:27:11,294       INFO Running <function <lambda> at 0x8594848>
2015-12-02 02:27:15,021       INFO Captured nothing
2015-12-02 02:27:15,021       INFO An exception during the transaction: Cannot register the node into 10.66.10.238!
Connection refused to 10.66.10.238
Full log: /var/log/vdsm/register.log
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/ovirt/node/ui/__init__.py", line 956, in __run_transaction
    self.plugin.dry_or(lambda: tx_element.commit())
  File "/usr/lib/python2.7/site-packages/ovirt/node/plugins.py", line 188, in dry_or
    return func()
  File "/usr/lib/python2.7/site-packages/ovirt/node/ui/__init__.py", line 956, in <lambda>
    self.plugin.dry_or(lambda: tx_element.commit())
  File "/usr/lib/python2.7/site-packages/ovirt/node/setup/vdsm/engine_page.py", line 392, in commit
    raise Exception(msg)
Exception: Cannot register the node into 10.66.10.238!
Connection refused to 10.66.10.238
Full log: /var/log/vdsm/register.log
2015-12-02 02:27:16,798       INFO Changes were merged successfully
</snip>

#/vdsm/register.log
<snip>
2/02/2015 01:54:32 AM Received the following attributes:
12/02/2015 01:54:32 AM Engine FQDN: 10.66.10.238
12/02/2015 01:54:32 AM Engine URL: https://10.66.10.238:443
12/02/2015 01:54:32 AM Engine https port: 443
12/02/2015 01:54:32 AM Check FQDN: False
12/02/2015 01:54:32 AM Fingerprint: None
12/02/2015 01:54:32 AM Node address: None
12/02/2015 01:54:32 AM Node name: localhost
12/02/2015 01:54:32 AM SSH User: root
12/02/2015 01:54:32 AM SSH Port: 22
12/02/2015 01:54:32 AM VDSM Port: 54321
12/02/2015 01:54:32 AM VDSM UUID: None
12/02/2015 01:54:32 AM Engine CA: /etc/pki/ovirt-engine/ca.pem
12/02/2015 01:54:32 AM Starting registration...
12/02/2015 01:54:32 AM Get version via: https://10.66.10.238/ovirt-engine/services/host-register?version=1&command=get-version
12/02/2015 01:54:32 AM Cannot connect to engine. 10.66.10.238 matches the FQDN of Engine?
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/vdsm/tool/register.py", line 476, in main
    reg.handshake()
  File "/usr/lib/python2.7/site-packages/vdsm/tool/register.py", line 138, in handshake
    res = requests.get(__GET_VERSION, verify=False)
  File "/usr/lib/python2.7/site-packages/requests/api.py", line 68, in get
    return request('get', url, **kwargs)
  File "/usr/lib/python2.7/site-packages/requests/api.py", line 50, in request
    response = session.request(method=method, url=url, **kwargs)
  File "/usr/lib/python2.7/site-packages/requests/sessions.py", line 464, in request
    resp = self.send(prep, **send_kwargs)
  File "/usr/lib/python2.7/site-packages/requests/sessions.py", line 576, in send
    r = adapter.send(request, **kwargs)
  File "/usr/lib/python2.7/site-packages/requests/adapters.py", line 415, in send
    raise ConnectionError(err, request=request)
ConnectionError: ('Connection aborted.', error(111, 'Connection refused'))
</snip>