This is an Authentication issue.

Give the account used to start the EMC Legato GST service"Administrator" access in NetWorker.In Window the default is theSYSTEM account and root in Unix.

You can do this from the command line below ( assuming you have used the default accout, else amend the line accordingly.

nsraddadmin -u user=SYSTEM,host=console_servername

Unix

nsraddadmin -u user=root,host=console_servername

Exactly this issue is an Authentication issue , The major cause for this issue is :
By Default, User Authentication for NetWorker is configured at the console
level (via Setup, Setup Menu->System Options). This setting allows only
users in the NetWorker administrator list to send requests to the NetWorker
server via the console window (ie to change a schedule etc). These request
will appear to come from the user running the console gui as opposed to the
gstd process owner on the console server (ie local system account on a
Windows Console servers). The user mentioned in the message is the user that started a Console server(gstd) and does not have enough privileges for impersonation. Impersonation means that a user is allowed to pretend that they are another user. The account that is requesting the right to impersonate another user, needthe "Change Security Settings" privilege set.

The solution is Loginto as administrator and just type the command
nsraddadmin -u user=root,host=console_servername in unix ,
nsraddadmin -u user=SYSTEM,host=console_servername in WIndows .


Rajesh

Whether Ur problem got resolved or not . Did you tried witht the command .