[ferret_users] Opendap error

Hi all ferret-users,

I need your help to solve a mistery. I have Ferret installed in 2 computers in the same network . One operates in linux, so I have ferret V6.0 to linux. The other one operates in Window XP, so I have ferret 5.51 to XP. With the Linux I dont get to use the Opendap, the error is

NOAA/PMEL TMAP
        FERRET v6
        Linux(g77) 2.4.21-32 - 08/23/06
        26-Apr-07 13:32

yes? use "http://username:passwd@xxxxxxxxxxxxxxxxxxxxxxxxx/thredds/dodsC/mercatorPsy3v1R1v_sat_mean_best_estimate"
**netCDF error
OPeND(OPeNDAP/netCDF Error code 1001)
Data set: http://olmonet:modkx@xxxxxxxxxxxxxxxxxxxxxxxxx/thredds/dodsC/mercatorPsy3v1R1v_sat_mean_best_estimate

But with the XP I dont have any problem

bash-2.05$ ferret
        NOAA/PMEL TMAP
        FERRET v5.51
        cygwin 1.3.x - 02/28/03
        26-Apr-07 16:41

yes? use "http://olmonet:modkx@xxxxxxxxxxxxxxxxxxxxxxxxx/thredds/dodsC/mercator
Psy3v1R1v_sat_mean_best_estimate"
yes? sho dat
     currently SET data sets:
    1> http://olmonet:modkx@xxxxxxxxxxxxxxxxxxxxxxxxx/thredds/dodsC/mercatorPsy3
v1R1v_sat_mean_best_estimate (default)
name     title                             I         J         K         L
TEMPERATURE
          temperature                      1:601     1:453     1:43      1:252
SALINITY salinity                         1:601     1:453     1:43      1:252
U        zonal velocity                   1:601     1:453     1:43      1:252
V        meridian velocity                1:601     1:453     1:43      1:252
KZ       vertical eddy diffusivity        1:601     1:453     1:43      1:252
SSH      sea surface height               1:601     1:453     ...       1:252
MLD      temperature ocean mixed layer t 1:601     1:453     ...       1:252
MLP      density ocean mixed layer thick 1:601     1:453     ...       1:252
TAUX     windstress eastward Tx componen 1:601     1:453     ...       1:252
TAUY     windstress northward Ty compone 1:601     1:453     ...       1:252
QTOT     total net heat flux              1:601     1:453     ...       1:252
EMP      water flux                       1:601     1:453     ...       1:252
QSR      surface downward solar heat flu 1:601     1:453     ...       1:252

The network have no PROXY. Could anyone explain me what is the possible problem with LINUX?