Cant copy from TFTP

[Marty Harrison]

I have a 3650 which I am trying to upgrade from a TFTP server on the same LAN. The tftp is used to automatically back up the config using archive commands so copying from Cisco to TFTP works all the time.

When I try to copy from TFTP to the Cisco I get a timeout. I can see the activity on the TFTPD log but the connection drops. I have seen similar issues when the MTU is set wrong. This box has MTU 1508 and so does the TFTP server.

I have the "ip tftp source..." set correctly. 

There is no windows firewall at all and no traffic restrictions. I have tried copying the config to the TFTP server (which works) and back again (which fails). 

Any ideas?

[Georg Pauwen]

Hello,

try and increase the TFTP blocksize:

3650(config)#ip tftp blocksize 8192

[paul driver]

Hello

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@Marty Harrison wrote:

There is no windows firewall at all and no traffic restrictions. I have tried copying the config to the TFTP server (which works) and back again (which fails). 

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Have you enable tftp server and specified the source location on the other device to be the server so it works the other way around?