Only if you have a setting in UnrealIRCd that allows servers to connect only to specific ports (what I mean here is the listen::options::clientsonly option).
link server.ca.us.network.com { <--- common irc server name
username *;
hostname 255.255.255.255; <--- server IP address
bind-ip *;
port 6660; <--- port servers link on
hub *;
password-connect "***********"; <--- server link password
password-receive "**************" { crypt; }; <--- server link pw
class servers;
compression-level 9; <-- ziplinks
options {
autoconnect;
zip; <--- enable ziplinks
ssl; <--- enable ssl
};
};