OF-1519 added more info

documentation/docs/install-guide.html

@@ -267,7 +267,10 @@ do so).
     
 Server's administrator should open TCP port 5222 for incoming connections for XMPP clients to be able to connect to Openfire.
 Additionally an administrator can also open TCP 9090 (for http) and TCP 9091 (for https), if there is a need to remotely administrate
-Openfire connecting to its Admin Console. We recommend only using 9091 port as it is an encrypted connection.
+Openfire connecting to its Admin Console. We recommend only using 9091 port as it is an encrypted connection. For server to server
+connections one should also open TCP 5269 port and for secure HTTP-BIND connections TCP 7443 port. Port number can be different, if
+the default configuration has been changed by an administrator. All ports used by Openfire can be found on the first page of 
+Admin Console in the Server Ports section.
 
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