udp of port 5001

Hi
I am using demo.traccar.org and my device can send udp without any problem
but when use demo4.traccar.org or install my own server on my vps also udp not work , just tcp work ,
I use port 5001
have any Idea for solve that ?

Please don't duplicate your questions.

https://www.traccar.org/forums/topic/traccar-is-not-showing-connections-in-log-file/#post-51598

I think that question not show ,
so demo.traccar.org and demo4.traccar.org has difference ?

Check the firewall port 5001 is only open for TCP or UDP or both, and please share the result.