GT06 GPS not connecting on VPS, works on Traccar Demo

Anton my mistake I didn't understand request for the Troubleshooting détail I am going to check it

Sorry, Anton, my mistake — I didn’t fully understand your request for troubleshooting details earlier. I’m going to check it now.

Hello,

I followed the official Troubleshooting guide to connect my GT06 GPS tracker to Traccar, but I still cannot get any HEX messages in the logs.

Steps I already tested:

Service check

ps aux | grep traccar
root 11505  0.2  4.2 4678224 348860 ?  Ssl  Sep26   3:33 /opt/traccar/jre/bin/java -jar tracker-server.jar conf/traccar.xml

Traccar service is running.

Web interface

sudo ss -tulpn | grep 8082
tcp   LISTEN 0 50 *:8082 *:* users:(("java",pid=11505,fd=622))

Web UI is working fine on port 8082.

GPS protocol port (5023)

nc -vz localhost 5023
Connection to localhost (::1) 5023 port [tcp/*] succeeded!

Port 5023 is open.
I also allowed it on the firewall (UFW + iptables).

Clone ports tested
I tried other common GT06/clone ports such as 5001, 5006, 5093, but the result is always the same:

2025-09-27 11:57:24  INFO: [T043f45fc] connected
2025-09-27 11:57:24  INFO: [T043f45fc] disconnected

Logs
There are no HEX messages in /opt/traccar/logs/tracker-server.log, only quick connect/disconnect events.

Conclusion

I followed the Troubleshooting steps carefully.

Server is running, ports are open, and device connects/disconnects.

I tested the standard GT06 port (5023) as well as known clone ports (5001, 5006, 5093).

Still no HEX messages are received.

Thanks for your help!

Your conclusion is probably wrong. That connect/disconnect is likely from the port check. It seems like you have some device issues that it doesn't connect at all.

Thank you for this information. I will do more research on this topic and analyze the situation more thoroughly.

Hello I managed to fix my probleme by adding the following line to my traccar.xml configuration file:

<entry key='decoder.gt06.port'>5023</entry>

After adding this entry, the connection issue was resolved. Hopefully, this helps anyone facing the same problem.
Thank you for your help and support.

There's no such configuration parameter, so adding this line does nothing at all.

These are my first times using a vps but I know that this line has changed the situation but if you say that this configuration does not exist then you are right about these your products after all