SugarCRM 5.5.2 Rest api -- login failure -

i need able use api sugarcrm exchange information several other applications. found api docs, , articles sample code. end result of code send command:

http://localhost/sugarcrm/service/v2/rest.php?method=login&input_type=json&response_type=json&rest_data={%22user_name%22:%22rest%22,%22password%22:%2265e8800b5c6800aad896f888b2a62afc%22,%22version%22:%22.01%22}

which produces error {"name":"invalid login","number":10,"description":"login attempt failed please check username , password"}null

i have googled error , found several others issue, no solution.

for me, needed use along lines of:

method=login&input_type=json&response_type=json&rest_data=$rest_data

the rest data is:

{   user_auth => {     user_name => $username,     password => $pw,     version => "1.2"   },   application => "foo" } 

(url encoded)