Default Linux security rules don't allow to access network ports < 1024 to non rooted processes. A bad idea would be to start your Tomcat as ROOT. Very bad idea!!! But these's another solution. You can start your Tomcat with a port > 1024 and then redirect requests from standard ports (such as HTTP/80 or HTPS/443) to ports > 1024.
Let's imagine you bound Tomcat https connector to 8301. We'll add a rule to iptables like this :
Prequisites : switch to root (su -)
iptables -A PREROUTING -t nat -i eth1 -p tcp --dport 443 -j REDIRECT --to-port 8301
Then, just check if rule is active with iptables -L
target prot opt source destination
ACCEPT tcp -- anywhere anywhere tcp dpt:https
Now, you can access your tomcat threw a classic https url :)
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