Unable to start sauce connect with proxy - next InitializeSecurityContext failed: SEC_E_UNTRUSTED_ROOT

I am using latest sauce connect in windows and works fine without proxy. Now if I use browsermobproxy, and try to start sauce connect, it fails with error

>sc -u userName -k token -i tunnelName --proxy 127.0.0.1::9091 --doctor
!!! ERROR: connecting via 127.0.0.1::9091 to http://saucelabs.com:443: Couldn't connect to server.
INFO: checking if accessing https://saucelabs.com/rest/v1 works
INFO: using proxy 127.0.0.1::9091 for https://saucelabs.com/versions.json (saucelabs.com)
!!! ERROR: connecting to https://saucelabs.com/versions.json: Couldn't connect to server, reply: [empty].
!!! WARNING: can't reach https://saucelabs.com/versions.json, please check your firewall and proxy settings.

for curl -v --proxy http://localhost:9091 https://ondemand.saucelabs.com/wd/hub/status getting

* schannel: encrypted data buffer: offset 2241 length 4096
* schannel: next InitializeSecurityContext failed: SEC_E_UNTRUSTED_ROOT (0x80090325) - The certificate chain was issued by an authority that is not trusted.
* Closing connection 0

what changes i need to make?