Error 5004 when trying to access hard-wired NAS

It's been quite a while since I tried to access my second NAS, called MyBookWorld. I could not even ping it successfully until I rebooted it by unplugging its power cord, waiting 30 seconds, and plugging in again. After a few minutes I was able to access it from Abrowser, but only as admin. I even refreshed my username/password. I'm running Trisquel 7 on a Lenovo T420 with 4GB of RAM and a ThinkPenguin WiFi dongle.

When I try to access MyBookWorld (the NAS) using Places...Network, I can see that MyBookWorld is part of my network, and I can now ping it successfully, but a 5004 error is returned when I try to access it either as admin or as username. If I enter the incorrect password, I'm kicked out without any error message.

In the LinuxMint forum, I found this syntax:
> sudo mount -t cifs -o username=user,password=urPassword,uid=1000,nounix //wdbookip/sharename /media/mywdbook

Which I've attempted to translate to my local setup:
sudo mount -t cifs -o username=amenex,password=fictitious,uid=1000,nounix 192.168.1.7 /media/mybookworld

But the system doesn't like the URL for MyBookWorld (192.168.1.7); I've tried http://192.168.1.7/, ftp://192.168.1.7.local and other permutations. I do have /media/mybookworld in place OK, though. Of course, my password isn't really "fictitious."

I went on to try this:
sudo mount -t cifs -o username=amenex,password=fictitious,uid=1000,nounix //192.168.1.7/MyBookWorld/ /media/mybookworld

The reply was:
> Retrying with upper case share name
> mount error(6): No such device or address

From admin access to MyBookWorld, the root folder seems to be DataVolume:
sudo mount -t cifs -o username=amenex,password=fictitious,uid=1000,nounix //192.168.1.7/DataVolume/ /media/mybookworld

But the reply still was:
Retrying with upper case share name
mount error(6): No such device or address

Reading the cifs man page ... too much information.

As a reality check, I accessed my other NAS thusly:
sudo mount -t cifs -o username=george,password=souititcif,uid=1000,nounix //192.168.1.8/Share/ /media/buffalolinkstation

And that syntax works fine; I can see all the contents of the Buffalo NAS's Share folder OK.

What's amiss with the MyBookWorld network access ?