Created attachment 1479521 [details]
evm.tail.log

Description of problem:
When proxy is set to invalid IP, no error appears in the evm.log so it looks like some fall-back was used to connect to the provider, or setting the new proxy values is ignored.

Proxy settings:
  :default:
    :host: 192.0.2.1
    :password: 
    :port: '1234'
    :user: 
    :scheme: 
  :gce:
    :host: 192.0.2.1
    :password: 
    :port: '1234'
    :user: 
    :scheme: 
 

Version-Release number of selected component (if applicable):
5.10.0.12.20180822200426_5f6e52b

How reproducible:
3/3

Steps to Reproduce:
1. Add a GCE provider
2. set proxy to invalid values
3.

Actual results:
Provider refresh works

Expected results:
Fail to refresh the provider because of the invalid proxy settings

Additional info: