the tftp transfer works and the contents of the file on the tftp server are correct. If I disable firewalld again on the fresh install of CentOS Linux release. maybe.) is related to the outbound request? I don't know. it looks like the fresh install is not recognizing that the return traffic (guessing some kind of ack. Journalctl -a | grep 10.102.10.124 returns things like: The transfer times out and, you guessed it, creates a blank file. I enabled FIREWALLD_ARGS=-debug=10 in /etc/sysconfig/firewalld I enabled LogDenied=all in /etc/firewalld/nf I rebooted the fresh install (firewalld set to start automatically) and tried the tftp file transfer and it timed out after creating an empty file. I tried the tftp file transfer again and it times out after creating an empty file just like before.Īgain, I stopped firewalld on the fresh install (systemctl stop firewalld) and attempt the transfer and it works!

Rule family='ipv4' source address='10.102.10.125/32' port port='5666' protocol='udp' acceptįirewall-cmd -add-service=tftp-client -zone=public -permanent So, I restarted firewalld and did the following (rich rules are for NRPE monitoring). Again, I stopped the firewalld service on the fresh install. the transfer goes through and the contents of the file are correct.

If I stop the firewalld service on the fresh install. it times out on the client but creates an empty file on the tftp server. When I try to TFTP from the fresh install to the known working TFTP server. I installed a fresh copy of CentOS Linux release. I have a working TFTP server that I use to backup a few dozen devices.

Public tftp server