Connection between the gps and Traccar server

hello,
i have a concox GT06N and i still have the same problem
Traccar is hosted on the subdomain and it works and i configured it to listen on port 5023
i configured the gps with "SERVER,1,subdomain,5023" and it still shows me GPRS: Link down GSM and there is not even a message in the track server logs

file traccar.xml:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE properties SYSTEM 'http://java.sun.com/dtd/properties.dtd'>
<properties>

    <!-- Documentation: https://www.traccar.org/configuration-file/ -->

    <entry key='database.driver'>org.h2.Driver</entry>
    <entry key='database.url'>jdbc:h2:./data/database</entry>
    <entry key='database.user'>sa</entry>
    <entry key='database.password'></entry>
    <entry key='gt06.port'>5023</entry>
</properties>

https://www.traccar.org/troubleshooting/

I have already consulted and I have followed the Server Troubleshooting and always when I do the tests on the port it shows me port is closed even though it is an open port

It has extensive information on why it could be the case. Have you checked all of that?

yes I have already checked but there is still a problem in the port it always shows me port closed even though it is open

If you don't provide more information than "I checked everything and it still doesn't work", we won't be able to help. You have to provide all details on what you checked and how you checked it, what's the output and results.

You find the gps configuration photos

Your should read the troubleshooting guide again.

Good morning Anton
in your opinion the problem is in the port or in the way of gps configuration because in the tracker-server log there is nothing

The troubleshooting guide represents my option and you should carefully read it.