I am using v 5.5 following rest tutorial

My code is in php, but i pulled together to request string:

http://localhost/sugarcrm/service/v2/rest.php?method=login&input_type=json&response_typ e=json&rest_data={%22user_name%22:%22jgoldstick%22 ,%22password%22:%22e8020a91e1b9c68eced2dbb8f8b8485 4

this produces this error:
{"name":"Invalid Login","number":10,"description":"Login attempt failed please check the username and password"}null

Can someone see what I am doing wrong