Paulo,I think the problem was that you were just trying access '06 data in the 2001 directory. The server is up and working fine. Try this link to that specific data granule you were seeking, it should work fine:
http://dods.jpl.nasa.gov/dods-bin/nph-hdf/pub/ocean_wind/quikscat/L3/data/2006/QS_XWGRD3_2006058.20062531612.gz.html Carl Wolfteich