Tuesday, March 8, 2016

Cisco ASA tftp Copies and Issues with atftpd

while attempting to copy a new anyconnect pkg file from a CentOS based server running atftpd, I received the following error on a Cisco ASA 5505:

%Error reading tftp://mytftpserver/anyconnect-win-3.1.14018-k9.pkg (Undefined error code)

On the tftp server in /var/log/messages, I saw:

Mar  6 14:49:19 mytftpserver  atftpd[15147]: Serving anyconnect-win-3.1.14018-k9.pkg to
Mar  6 14:49:19 mytftpserver atftpd[15147]: Requested file to big, increase BLKSIZE

I had installed tftp a while ago... specifically atftp-server. After looking at the man page for in.tftpd, I concluded there was no good way to set BLKSIZE on this package. The fix was:

sudo yum erase atftp-server
sudo yum install tftp-server

I then edited the xinet.d/tftp file to enable it and change the target directory and restarted xinetd. After this, I was able to copy the pkg file over successfully.