Can't get tftpd working

I have two F21 systems on the same subnet. Client and server. On the server I created a directory /root/tftp with 777 permissions. I have opened up the tftpd service with the firewall gui interface and firewall-cmd --zone=public --list-all shows services includes tftp (I am assuming here that firewalld knowns that tftp is a udp app) The server is running tftpd in foreground under sudo: in.tftpd -Lc4pv -s /root/tftp The client connects with 'tftp server' and gets tftp> prompt. A status shows the client is connected to the server (thus firewall is allowing connection). But a put fails with 'Transfer timed out'. There are no messages logged. I have tried increasing verbosity with 'vvv' but no logging. I have even created a file on the server under /root/tftp and tried to 'get' it, which also timed out. So what am I missing here?