Bower Tunnelling error in corporate proxy

I am trying to setup new Ember application using ember-cli but getting this error even after updating proxies in "C:...\bower\node_modules\bower-config\lib\util\defaults.js"

Installed packages for tooling via npm. Error creating new application. Removing generated directory ./ember-quickstart Request to http://ift.tt/1TkEqTN failed: tunnelin g socket could not be established, cause=write EPROTO 101057795:error:140770FC:S SL routines:SSL23_GET_SERVER_HELLO:unknown protocol:openssl\ssl\s23_clnt.c:794:

Error: Request to http://ift.tt/1TkEqTN failed: t unneling socket could not be established, cause=write EPROTO 101057795:error:140 770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol:openssl\ssl\s23_clnt. c:794:

at createError (C:\Users\user\AppData\Roaming\npm\node_modules\ember-cli\no de_modules\bower\lib\node_modules\bower-registry-client\lib\util\createError.js: 2:15) at Request._callback (C:\Users\user\AppData\Roaming\npm\node_modules\ember- cli\node_modules\bower\lib\node_modules\bower-registry-client\lib\lookup.js:97:2 9) at self.callback (C:\Users\user\AppData\Roaming\npm\node_modules\ember-cli\ node_modules\bower\lib\node_modules\request\request.js:198:22) at emitOne (events.js:77:13) at Request.emit (events.js:169:7) at Request.request.emit (C:\Users\user\AppData\Roaming\npm\node_modules\emb er-cli\node_modules\bower\lib\node_modules\request-replay\index.js:89:29) at Request.onRequestError (C:\Users\user\AppData\Roaming\npm\node_modules\e mber-cli\node_modules\bower\lib\node_modules\request\request.js:820:8) at emitOne (events.js:77:13) at ClientRequest.emit (events.js:169:7) at ClientRequest.onError (C:\Users\user\AppData\Roaming\npm\node_modules\em ber-cli\node_modules\bower\lib\node_modules\tunnel-agent\index.js:178:21)

Thanks in advance.