install domjudge and judgehost in separate machine

hi, i want to install the domjudge and the judgehost in separate machine.but the problem is i cant connect the domjudge to the judgehost. the instruction said:

"the DOMjudge REST API credentials on domserver need to be synchronized to each judgehost and edited to point to the domserver."

is the /etc/domjudge/restapi.secret the right file??

this is my restapi.secret in judgehost server : default http://10.10.30.71/domjudge/api domjudge oP0MRGIegQtV6rJd

10.10.30.71 is the domjudge's ip address. and 10.10.30.73 is the judgehost's ip address.

i cant solve this problem for around 2 weeks now. any help will really be appreciated