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Cisco ASA 8.0.5 TFTP Unspecified Error using PumpKIN

I have run into a problem on two separate ASA’s now downloading code to them using the PumpKIN TFTP server.  It get’s part way through the download and dies (at different places each time so it’s an intermittent error).

I was running a 7.0.8 release on these devices, and then upgraded to 8.0.5 (copying the file off a PumpKIN TFTP server with no issue), but then I was reloading 8.0.5 onto the devices (while booting off 8.0.5 already) and it could not access the exact same file properly.

ciscoasa# copy tftp flash
ciscoasa# copy tftp flash Address or name of remote host []? Source filename []? asa805-k8.bin Destination filename [asa805-k8.bin]? Accessing tftp://!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! WARNING: TFTP download incomplete! ! %Error reading tftp:// (Unspecified Error) ciscoasa#

I ended up using the SolarWinds TFTP server instead and it worked like a champ.  I am not sure what the issue is here, but it looks like some kind of bug in PumpKIN or in the ASA code (or some combination thereof).


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  1. Wallis Short
    May 10th, 2010 at 08:24 | #1

    There is an issue with some TFTP servers handling large files etc. In the old days cisco tftp could not handle any size over 16Mb etc and I suspect Pumpkin does the same. I know SolarWinds is not immune to it as I had a problem with them a couple of weeks ago uploading large Voice files to a 2811’s flash memory. The tftp server i now use ( and it handles large files – biggest I have had is 103Mb) is the opensource 3CDeamon TFTP server. Try that , i’m sure you wont have any issues.

  2. March 31st, 2011 at 11:27 | #2

    Hey Eric,

    I ran acroos your site on Google after I was having a similar issue uploading a new image to an ASA in a far off land. I didn’t have any trouble using Solarwinds TFTP server (Included with the Engineer’s toolset V10) with ASA’s that were geographically closer, but this one device kept giving me issues.

    For me the latest version of TFTPd32 did the trick.

    Thanks for sharing your info!

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