Thanks odevans and gbonvehi for your answers!
Remark on odevans' answer.
Yes, the URL http://ftp.gwdg.de/pub/linux/knoppix...5-09-23-EN.iso
is completely valid (denying access doesn't mean the file does not exist). To completely make sure about the existence of the file pub/linux/knoppix/dvd/KNOPPIX_V4.0.2DVD-2005-09-23-EN.iso at http://ftp.gwdg.de/
you may proceed step by step as follows:
Open an Internet browser (Firefox say) and access http://www.knoppix.com
Click on the "Download" icon from there
Click on the "http" choice associated with the ftp.gwdg.de link
At this point you are at the "KNOPPIX download agreement
" page; so do click on the ">>>Accept>>>" button
Now you are at an index of directories and files: so do click on dvd/
Now you are at the "Index of /pub/linux/knoppix/dvd
" page. Put your mouse finger on KNOPPIX_V4.0.2DVD-2005-09-23-EN.iso
and concomitantly have a look at the bottom of your screen, to see the actual URL of that file: indeed it reads http://ftp.gwdg.de/pub/linux/knoppix...5-09-23-EN.iso
therefore that URL is valid.
Remark on gbonvehi's answer.
The missing "i" of "knoppix" is only a mistake in my post from above but, when I experienced the failure of the command
I have not missed that "i". However you answered me as "You're missing the "i" in the word "knoppix" on the links, if you write it right, it works.
" Please do make precise: have you realy run the right command and thereby verified its success? I have run it but it failed to open the aimed file (see the already mentioned message concerning the "Access Failed").
The same failure with other URLs.
Since the Knoppix mirrors may rise access problems, I have chosen to also verify the lftp
command for UBUNTU mirrors. So I have run (as root) the following command
and received the same failure message
cd: Access failed: 404 Not Found (/pub/ubuntu-cdimage/kubuntu/dvd/current/breezy-dvd-i386.iso)
though I did verify the direct access (by Firefox) to the http://ftp.heanet.ie/pub/ubuntu-cdim...y-dvd-i386.iso
Any other idea about this experience with lftp?