Check if your ISP blocking your ports.

main.go

package main

import (
	"log"
	"net"
	"strconv"
	"sync"
)

const (
	HOST = "0.0.0.0"
	TYPE = "tcp"
)

func start(PORT string) {
	listen, err := net.Listen(TYPE, HOST+":"+PORT)
	if err != nil {
		log.Println(err)
		return
	}
	// close listener
	defer listen.Close()

	for {
		conn, err := listen.Accept()
		if err != nil {
			log.Println(err)
		}
		go handleIncomingRequest(conn)
	}
}

func handleIncomingRequest(conn net.Conn) {
	log.Println("connection accepted on", conn.LocalAddr().String())
	conn.Close()
}

func main() {

	var wg sync.WaitGroup
	wg.Add(1)

	for i := 1; i < 65535; i++ {
		t := strconv.Itoa(i)
		go start(t)
	}
	log.Println("Server started on port 446 - 65535")

	wg.Wait()

}

test.py

import socket

server_ip = "YOUR IP HERE"

for n in range(1, 1 << 16):
	s = socket.socket()
	s.settimeout(3)
	try:
		s.connect((server_ip, n))
		print(f"Port - {n:<6} is Open")
	except ConnectionRefusedError:
		print(f"Port - {n:<6} is Blocked")

	except socket.timeout:
		print(f"Port - {n:<6} is Timeout")