Linux: tftp not working, transfer timed out, what could be the reason?

I have a server which runs cobbler and tftp server. My task is to configure a read-write tftp server. tftp is configured through xinetd and the configuration file looks like so:

service tftp < disable = no socket_type = dgram protocol = udp wait = yes user = root server = /usr/sbin/in.tftpd server_args = -B 1380 -v -s -c /var/lib/tftpboot per_source = 11 cps = 100 2 flags = IPv4 >

• tftp directory is: /var/lib/tftpboot
• selinux and iptables are disabled
• permissions on folder are as follows:

drwxrw-rw-. 8 root root 4096 2015-12-20 11:17 /var/lib/tftpboot/

• netstat shows that the port is opened:

udp 0 0 0.0.0.0:69 0.0.0.0:* 21455/xinetd

• There are no errors in the /var/log/messages log

This is how I test the configuration:

[root@ams2srv1 ~]# touch file.test [root@ams2srv1 ~]# tftp localhost tftp> put file.test Transfer timed out. tftp> quit [root@ams2srv1 ~]# tftp localhost -c put file.test Transfer timed out. [root@ams2srv1 ~]# [root@ams2srv1 ~]# touch /var/lib/tftpboot/test.file [root@ams2srv1 ~]# tftp localhost -c get test.file Transfer timed out. 

Edit #1: When trying the same commands while connecting to the real IP of the machine there's a new error message which looks like so:

[root@ams2srv1 ~]# tftp 10.x.x.38 tftp> put test Error code 0: Permission denied tftp> 

But the permissions on the /var/lib/tftpboot folder are 777 as shown above.

Any ideas about how to solve this issue?