I tried to to host bitcoin core json-rpc to listen other than localhost but it would not work even i set it to listen to ip 0.0.0.0

My config (for bitcoin.conf)

    testnet=1
    server=1
    daemon=1
    listen=1
    rpcuser=something
    rpcpassword=secret
    rpcport=8332
    rpcconnect=0.0.0.0

So how do i make it so that it will listen to ip other than localhost or 127.0.0.1?