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Debian 9 tftp issue

Hello everyone,

I am trying to setup a PXE server on a computer on which I've just installed Debian 9.2.

So I've installed tftpd-hpa, and left the configuration as it was:

But, I can't connect to port 69, from other computers. I'm getting a timeout

This seems very strange, since I can see the tftp service in netstat:

:~$ sudo netstat -tulpn
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name    
tcp        0      0    *               LISTEN      488/sshd            
tcp        0      0  *               LISTEN      922/exim4           
tcp6       0      0 :::22                   :::*                    LISTEN      488/sshd            
tcp6       0      0 ::1:25                  :::*                    LISTEN      922/exim4           
udp        0      0    *                           535/dhclient        
udp        0      0    *                           1117/in.tftpd       
udp        0      0  *                           465/avahi-daemon: r 
udp        0      0  *                           664/minissdpd       
udp        0      0 *                           465/avahi-daemon: r 
udp6       0      0 :::52077                :::*                                465/avahi-daemon: r 
udp6       0      0 :::5353                 :::*                                465/avahi-daemon: r 

The firewall was left with its defaults on this computer:

:~$ sudo iptables -L -nv
Chain INPUT (policy ACCEPT 968 packets, 96829 bytes)
 pkts bytes target     prot opt in     out     source               destination         

Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination         

Chain OUTPUT (policy ACCEPT 525 packets, 129K bytes)
 pkts bytes target     prot opt in     out     source               destination         

However, if I check the ports from other computers, it seems that nothing's listening there:

:~$ nc -vz lab 69
lab.home.org [] 69 (?) : Connection refused
:~$ nc -vz lab 22
lab.home.org [] 22 (ssh) open

But, if I try to connect from localhost, I can get a test file that I've created in /srv/tftp/:

:~$ echo "get hello.txt" | tftp
tftp> Received 7 bytes in 0.0 seconds

Does anybody know what's happening here? What I should check?
Please help me with any suggestions or ideas you might have.

Thank you,