First

su -
yum -y install tftp

If you are running iptables either:

iptables -I INPUT -s ip.address.tftp.server -p udp -m udp --dport 2000:2020 -j ACCEPT

0r

systemctl stop iptables

If you are running firewalld

Execute the command to permit inbound udp traffic on ports 2000 to 2020

or

systemctl stop firewalld

Now, find the name of a file on your tftp server – any file. I have one I created named DoNotDelete-TestFile just for testing. Then execute the following command:

tftp -4 ip.address.tftp.server -R 2000:2020 -c get DoNotDelete-TestFile 

If you now have the file on the current directory – everything is working. If you dont have the file you need to start troubleshooting.

Note – if you are going through a router or firewall, see if you can connect your computer on the same network with the tftp server. If it works then, check the settings of the firewall or router. Many times the default configuration will block tftp traffic