This may look like a duplicate question but I did my share of searching, but could not find any solution. I have created a tftp server, this server when accessed from a local tftp client, over a loopback gets and puts the file just fine.

When TCP session is idle for more than 15 mins (900 secs), IPVS connection times out and gets cleared from the connection table. There are two different timeouts — one for IPVS and another one for TCP.

When I try to access the server through an external client, The request times out. The connection is established. I can see the connection as connected in the tftp client, no issues there. The File transfer does not start.

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The client is connected directly to the HOST via a ethernet cable, I have created a 2 Device LAN. Pings work between them. I initially thought this to be a firewall issue, now I have disabled the firewall, allowed INPUT and OUTPUT on the configured port 69 in the iptables. Also udp is allowed on port 69. I am also Not running multiple instances of the tftpd-hpa server, it is running as a daemon, and netstat -aup has only one tftp server running.

The clients are giving proper requests, I can see them in wireshark, but nothing goes out in response. And the failure is always a TIMEOUT. **firewall disabled** **ports allow connection ** **file transfer fails** ** outgoing tftp request as a client to other tftp servers is alos blocked ** Update2: I was not really sure about the Firewall thing, as this laptop was issued by my employer and I am skeptical that they wont allow the firewall to be disabled. Reading the /var/log/syslog did not give any hints so tried looking at the kernel prints as to whether any kmodules were doing anything fishy, I see these ones.

[31] FIREWALL: IN=eth1 OUT= MAC=50:7b:9d:f9:44:5d:68:9e:19:99:9e:e4:08:00 SRC=10.42.0.89 DST=10.42.0.1 LEN=65 TOS=0x00 PREC=0x00 TTL=255 ID=117 DF PROTO=UDP SPT=2495 DPT=69 LEN=45 The SRC, DESTT, DPT, PROTO the MAC Address all match my tftp client. I cannot really tell, what is happening here, so if anyone can give me hints to look for some logs or something else, It would be really helpful. After this I installed gufw to manage the firewall and allowed all incoming and outgoing traffic. I still get timeouts, and this is what I now see on syslog. Sep 5 16:16:01 arun-TP kernel: [53] [UFW AUDIT] IN= OUT=eth1 SRC=10.42.0.1 DST=10.42.0.255 LEN=184 TOS=0x00 PREC=0x00 TTL=64 ID=12630 DF PROTO=UDP SPT=17500 DPT=17500 LEN=164 Sep 5 16:16:01 arun-TP kernel: [70] [UFW ALLOW] IN= OUT=eth1 SRC=10.42.0.1 DST=10.42.0.255 LEN=184 TOS=0x00 PREC=0x00 TTL=64 ID=12630 DF PROTO=UDP SPT=17500 DPT=17500 LEN=164 This time the DST does not make sense, The client is at 10.42.0.89 and not 10.42.0.255. You are right, some posts suggested using atftpd for the same. But sadly all in vain.

I have my firewall disabled, 'ufw status' is inactive so I think that should not be a problem. And cannot fathom why would it do block tftp if it is inactive., as for the client, I tried tftp from uboot, and I think the bootloader would not put any restriction to movement of files as many people have got it working, I have taken your advice on packet sniffing. User wireshark.

My server receives ARP and then TFTP requests (many of them) but nothing goes out to the client. – Sep 5 '16 at 8:35 •.