cannot access ecp on mailbox role server 2013

i have one exchange server 2013 with CAS  and mailbox role installed. which can access ecp without problem.

now, i setup a new server only with mailbox role, but i find that i cannot access the local ecp and the exchange virtual directory port changed to 444 instead of 443 on the mailbox server.

i try https://mailboxserver:444/ecp

with display 400bad request 

do i need to add CAS on the server to make this work?