The instructions for setting up ssh for git (https://secure.phabricator.com/book/phabricator/article/diffusion_hosting/) require moving regular ssh to a port other than 22 so that phabricator can used ssh on port 22.
Is there a way to do the opposite? Leave normal admin-access sshd on 22 and make phabricator use 222 (or another)? The box we're running phabricator on also hosts other developer resources and services, and moving normal ssh to a non-standard port is not an option.