I sometimes need to upload data to Red Hat's dropbox service, and most of the times I need to go through a proxy of some sort. Here's a quick note on how to configure lftp to use such a proxy.

# lftp
lftp :~> set ftp:proxy http://USER:password@yourproxy:8080
lftp :~> open 209.132.183.100
lftp 209.132.183.100:~> user anonymous
Password: 
lftp anonymous@209.132.183.100:~> cd /incoming
cd ok, cwd=/incoming
lftp anonymous@209.132.183.100:/incoming> put yourfile.tar.gz -o YOURCASENUMBER-yourfile.tar.gz

As you can see:

I used the set ftp:proxy command to configure the proxy.
Then I used 209.132.183.100 rather than dropbox.redhat.com . Some proxies do not work if using the DNS hostname, for some reason.
After that, I blindy changed into /incoming . It's the only directory with allowed wrting permissions
Finally I used put -o to specify the destination filename.

Additional notes on configuring lftp to upload information to Red Hat can be found in KCS 2112 .

Happy hacking!