Ionic login Error

When I try to run “ionic login” command from the command prompt, I get the following error,
Error: unable to verify the first certificate

ionic info,
C:>ionic info
[WARN] You are not in an Ionic project directory. Project context may be
missing.

global packages:

@ionic/cli-utils : 1.4.0
Ionic CLI        : 3.4.0

System:

Node       : v6.11.0
OS         : Windows 8.1
Xcode      : not installed
ios-deploy : not installed
ios-sim    : not installed
npm        : 3.10.10

Not behind any proxy (Refer to the screenshots)

Needed some help in resolving this

Something is messing with your certificates. Company computer?

Can you try with another connection?

Nopes not a Company System
Happening on personal laptop & home network

Well then, nothing I can do to help. Open an issue here:
https://github.com/ionic-team/ionic-cli/issues