When using the web client you are supposed to use an admin ID to log in.
The node user ID and password are still used but are taken care of behind
the scenes.  The node ID is coming from the dsm.opt file on the node.  The
node password is coming from the passwordaccess generate option in the
dsm.opt file (it is saved to a file in NetWare) on the node.  When the Web
client was introduced this new method of authentication was also introduced.
You may notice that when you register a new node a new admin ID is also
created (unless you specify "NONE").  This new ID has ownership rights to
that node.  This translates into the right to backup and restore data
through the web.  Do a help reg admin for more information on this.

Hope this helps.

Kyle