tftp transfer fails with "Transfer timed out." exception

bupthebroker · 05-10-2018, 08:44 AM

Hi,
i am trying to run a tftp server on my Mint 17.2 but there are a few problems:

1) cat /etc/xinetd.d/tftp

Code:

service tftp
{
protocol        = udp
socket_type     = dgram
wait            = yes
user            = nobody
server          = /usr/sbin/in.tftpd
server_args     = /tftpboot
disable         = no
}

now GET works but PUT gives an error: "Error code 2: Access violation" (for new files, if a file with the same name already exists then its okay)

2) cat /etc/xinetd.d/tftp

Code:

service tftp
{
protocol        = udp
socket_type     = dgram
wait            = yes
user            = nobody
server          = /usr/sbin/in.tftpd
server_args     = -c /tftpboot
disable         = no
}

now GET and PUT both time out with the following message: "Transfer timed out."

What could be the problem and how to resolve? I also tried the -s and -v args but no luck.

Thanks!

jefro · 05-10-2018, 02:47 PM

Hello and welcome to LQ.

Not sure if a command line tftp is wrong when it refuses to create a file. Seems that is a long ago issue. Could be some other program would work but a lot of times one must create a file first with touch.

It may be that you have to issue the -c argument in the tftp statement ?? Check with man tftp for your version of tftp to be sure of the correct arguments/switches.

bupthebroker · 05-11-2018, 04:09 AM

Hi,
i also read that some people have been struggling with it. The problem is that i do not know which application in the build calls this and cannot change the tftp statement itself. Neither do i know which files to create beforehand with touch. I will take any known workaround if someone knows of one.

AwesomeMachine · 05-11-2018, 10:13 PM

I think you have to explain that last post a bit more. You're saying, some unknown application uses tftp? You don't know what this application is sending or receiving via tftp? But you tried tftp manually and reported the results here?

It looks like the permissions on the server might be incorrectly set. tftpboot should have 777 permissions (rwxrwxrwx).

bupthebroker · 05-15-2018, 02:33 PM

Hi,
777 is set.

These are the results of my manual tftp tests indeed. In the real workflow i get the same errors. I cannot change the tftp statement itself there since this is inside some legacy binary somehow part of a huge procedure. I can play around with permissions and config files but so far no luck.

Could someone please confirm that it is indeed possible to create files with tftp with the -c option in the /etc/xinetd.d/tftp file?