SSH cannot connect after listen port changed to 2288

==== Required information ====
- iRedMail version: 0.8.7
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Linux/BSD distribution name and version: Ubuntu 14.04 LTS
- Related log if you're reporting an issue:
====

For iRedMail, what other considerations for changing SSH listen port from 22 to 2288?
After updating /etc/ssh/sshd_config and sudo restart ssh, PuTTy no longer connecting.
To troubleshoot, disabled firewall on server ( sudo ufw disable ) and on remote PC, no SSH on 2288.
To run a test, revert server pre iRedMail install, and port change to 2288 works without issue.
Same server with iRedMail istalled, port change does not work.  Also tried port 22888.  Any suggestions?