Error opening tftp:// (Time Out)

Question

There i am trying to copy my running-config file from Cisco Access Point to
my Linux machine /tftpboot/ directory, but there i am getting issue like

user@device#telnet 192.168.xxx.x
Trying 192.168.xxx.x...
Connected to 192.168.xxx.x (192.168.xxx.x).
Escape character is '^]'.

User Access Verification

Username: Cisco
Password:
ap>en
Password:
ap#copy running-config tftp:
Address or name of remote host []? 192.168.xxx.x
Destination filename [ap-confg]? backup_config_192_168_xxx_x
.....
%Error opening tftp://192.168.xxx.x/backup_config_192_168_xxx_x (Timed out)

There i have set the firewall rule also on my Linux machine as given command

(/sbin/iptables -L INPUT | /bin/grep 192.168.xxx.x | /bin/grep tftp || /sbin/iptables -I INPUT -p UDP -i eth0.100 -s 192.168.xxx.x --dport 69 -j ACCEPT) > /dev/null 2>&1
/sbin/iptables -A INPUT -i eth0.100 -s 192.168.xxx.x -p udp -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT > /dev/null 2>&1
/sbin/iptables -A OUTPUT -o eth0.100 -s 192.168.xxx.x -p udp -m state --state ESTABLISHED,RELATED -j ACCEPT > /dev/null 2>&1

eth0.100 is interface for access point

Answer 1

What permissions does the directory have? You can make it temporarily accessible for everyone to try. CHMOD777 /tftpboot

Answer 2

I am assuming you checked that port 69 is listening netstat -4lupen and also have pinged the server from the switch. I don't know what linux you are using, but on debian I had this issue. No idea why. I just installed another tftp server and it worked (tftpd-hpa)