I apologise for not speaking enough Portugese to be able to answer you properly.
My poor translation skills lead me to think you have installed Jira and it is working on your local machine when you connect to localhost:8080 ? But you want it to be available on your network.
The standard list of things to do:
Open up the firewall on the correct ports, so that the outside world can reach your server.
Set up DNS, so http://yourjiraserverresolves to the IP address of your server
Think about using a proxy server to serve up Jira without a port (or change the port it runs on the server if it is the only application on it)
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