vagrant plugin install vagrant-proxyconf

Installing the 'vagrant-proxyconf' plugin. This can take s few minutes...
ERROR: SSL verification error at depth 1: unable to get local issuer certificate (20)
ERROR: You must add /DC=net/DC=<MY_COMPANY>/DC=corp/CN=<CA-Name> to your local trusted store
Vagrant failed to load a configured plugin source. This can be caused by a variety of issues, proxy filtering rejecting access to a configured plugin store, or a configured plugin source not responding correctly. Please review the error message below to help resolve the issue:

SSL_connect returned=1 errno=0 state=error: certificate verify failed (https://api.rubygems.org/specs.4.8.gz)

set http_proxy=http://user:password@host:port
set https_proxy=http://user:password@host:port
vagrant plugin install vagrant-proxyconf