[ydl-gen] SSH and hung with YDL 4.0 and G4

[Kai Staats]

> > file.iso.gz                                 35%   66MB 100.7KB/s  --
> > stalled --

Try a different mirror ... and per Derick's suggestions, maybe talk to your 
sys admin to determine if there is a download limit imposed at your place of 
work (if this is where you are conducting the download).

kai