This error indicates that the TFTP server has returned an “Access Denied” error (TFTP code 2).

Things to try:	 
  * Check that you are attempting to download the correct file.	 
  * Check that you provided a protocol while trying to download it from HTTP.
  * Check the permissions on the file you are trying to download.	 
  * Check the TFTP servers logs	 
  * Check that you can download the file using another TFTP client, such as tftp-hpa on Linux.	 
  * If you are using qemu's embedded TFTP server, try adding an extra leading slash to your filename (to work around a known qemu bug).  For example, if your DHCP server is currently handing out <code>  filename "pxelinux.0";</code>then try changing this to <code>  filename "/pxelinux.0";</code>	 
  * Use tcpdump or wireshark to see exactly which file is requested