Give a meaningful error message if goiardi can't use the specified port
Give a meaningful error message if goiardi can't use the specified port

ctdk/goiardi,theckman/goiardi,QuinnEbert/goiardi,QuinnEbert/goiardi,rajthilakmca/goiardi,ctdk/goiardi,theckman/goiardi,rajthilakmca/goiardi