If this is what you tell me. Through the port 8080 if I get the gadgets
If you can get the gadgets over port 8080, but not anywhere else, then it is your network. Where-ever you are running Jira, url and port, you need to make sure the Jira server can reach itself.
Check what your "base url" is in Admin -> General configuration. If it is "https://xxx.yyy.zzz", make sure your network is set up to tell your Jira server where that is and allow it to connect to it.
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I am sorry I cannot answer in Spanish.
Are your gadgets showing a title like __msg__blahblah ? If so, that usually means that your Jira is unable to reach itself over the network. See https://confluence.atlassian.com/jirakb/how-to-fix-gadget-titles-showing-as-__msg_gadget-813697086.html
If it is not that, then can you explain what you see in the title and what you expect.
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