Hi All,
I’m a very beginner to mikrotik and quite noob in general 
I need to send some data to a specified ip and port:
144.76.105.244
UDP port: 2609
But it seems that the router (LTE18) is blocking these outgoing connections.
There is any way to check this?
In a default situation the router won’t block this (any) traffic outgoing.
Can you share your config (at least the /ip/firewall part)?
/ip/firewall export
or
/export file=anynameyoulike
Are you using LTE? Could be that the provider is blocking the traffic.