I'm wanting to change port 22 to something else. I came across these steps to secure Ubuntu. Would this break Zimbra?

Code:
* Create Key Pair

	- run: ssh-keygen

	- passphrase: WHATEVERYOUWANTHERE

	- run: cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys

	- run: rm ~/.ssh/id_rsa.pub

	
* Move Key to Local Machine


* Configure SSHD on Server

	- run: sudo cp /etc/ssh/sshd_config /etc/ssh/sshd_config.factory-defaults

	- run: sudo chmod a-w /etc/ssh/sshd_config.factory-defaults

	- run: sudo vi /etc/ssh/sshd_config

		****MAKE THESE CHANGES****

			Port 22 ---> Port ****

			PermitRootLogin yes ---> PermitRootLogin no

			#PasswordAuthentication yes ---> PasswordAuthentication no

			#Banner /etc/issue.net ---> Banner /etc/issue.net

			UsePAM yes ---> UsePAM no

			***Add To Bottom***

			AllowUsers YOURUSER

	
	- run: sudo /etc/init.d/ssh restart