Setting up relay on Ubuntu 16.04

This is our torrc file configuration:

    SocksPort 0
    RunAsDaemon 1
    ORPort 9001
    ORPort [2409:4070:219c:d7f8:94cf:ac05:ee3b:b21c]:9001
    ContactInfo itstrulyjenni(at)gmail(dot)com 
    #DirPort 9050
    IPv6Exit 0
    ExitPolicy reject *:* # no exits allowed
    ExitPolicy reject6 *:*
    DisableDebuggerAttachment 0
    ControlPort 9051
    CookieAuthentication 1

We are trying to start tor with both ipv4 and ipv6. Service is able to start. But after it say checking for ORPort and DirPort connectivity it says….

Your server (xx.xx.xx.xx:9001) has not managed to confirm that its ORPort is reachable. Relays do not publish descriptors until their ORPort and DirPort are reachable. Please check your firewalls, ports, address, /etc/hosts file, etc.

What can be issue here? Iptables are set in Accept policy.
Please reply asap. Thanks for your valuable time in advance.