Bruteforcing via port 88 on MacOS

Macos has open port 88 by default. Is it possible to check validity of the password via this port from Linux and how? If the vncserver is active, it is possible to know also the username (by connecting to it with vncviewer) what would make brute forcing easier. Does openssh on macos has something built-in to prevent bruteforcing, assuming it is also enabled?