Hi, First of all this is my first post on this forum

Anyways I have created a java tcp socket server that listens on a certain port, I am able to connect to its ip : port via my client hosted on a website, lately this guy has been making it harder for me to test my client more and more because he was able to decompile my client and find out what port my server is running on and than he made his own modified client that can spam my tcp server, I am trying to figure out a way that my tcp server will only listen to the client on my website, NO OTHER CLIENT only the one on my site, And it has come to my understanding that in the /etc/hosts.allow file can do this, but i tried many methods using it starting with ALL: because my java server isnt run as a daemon and i dont know what to specify it as, also if anyone has a better approach please let me know.

Use your firewall. Block all ip addresses you do not want to connect to your server on the specified port that your java app listens to.

You can only use hosts.allow if your code uses tcp wrappers http://www.linuxtopia.org/online_boo...-wrappers.html aka libwrap or run through the xinetd daemon.

As above, if your client has a know fixed IP, you can use iptables (firewall system) to allow by exception.

Just thinking to myself.

Go wild maybe and rotate ports. After sync to program use a scheme to rotate ports.