Proxy not working in Chrome and getting error

I have opened the chrome with proxy command line switch

--proxy-server="https=http://:"but I am facing "(failed)net::ERR_PROXY_CONNECTION_FAILED". But the same proxy is working in Firefox.

I have disabled the Proxy server at LAN settings level.Tried accessing mutliple websites but still getting same error. I have tested the chrome and firefox on same Network but still facing error in chrome where as it is working in firefox.

What additional settings/configurations required to open chrome with proxy not at system LAN settings level?