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?