TFTP Server cannot receive files

Question

Hey guys,

I am trying to use the TFTP server to receive config and binary files from my router. When I attempt a "copy run tftp" I get an error saying that it timed out. On the TFTP server i see the following:

TFTP connected from xx.xx.xx.xx:62418 on 6/15/09 5:17:40PM, binary, PUT, Interrupted by client, cause: The process cannot access the file because it is being used by another process

TFTP connected from xx.xx.xx.xx:62418 on 6/15/09 5:17:40PM, binary, PUT, Renamed existing file to: C:\TFTP-Root\xxxxx.xxx.bin

TFTP connected from xx.xx.xx.xx:62418 on 6/15/09 5:17:40PM, binary, PUT, File Exists, C:\TFTP-Root\xxxxx.bin

TFTP connected from xx.xx.xx.xx:62418 on 6/15/09 5:17:40PM, binary, PUT, Started, file name: C:\TFTP-Root\xxxxx.bin

I'm a little befuddled here...I've used Solarwinds TFTP server for years and never had this sort of issue. Any ideas?

Thanks,

-Sean

steveclawson · Accepted Answer

Here's the answer to the problems I was having: It turned out to be a routing issue. We're on an MPLS network and don't advertise our WAN addresses to the inside of our network because of the increase in size of the routing tables. Even though we were using the LAN interface IP for the tool, The tftp request packets coming from the router had the ip addresses of the WAN interface. All packets destined for that ip address were going to the default route (meaning our internet connection).  The fix for us is to use the Cisco "ip tftp source-interface" command to tell the router to put the LAN side address in the tftp packets it sends.  Our other option is to advertise the WAN IP's to the internal network.  My confusion was coming from the "file being used by another process" error message. Hope this helps someone else!