Triode's Spotify plugin is missing from the LMS plugins list

[oskaalb]

I've been using a Squeezebox Duet with a NAS disk for some time, but
I've never been really happy with it. Great when it works, but a lot of
hassle when something gets wrong. And it usually does.
I'm running LMS 7.7.1 on a Netgear ReadyNAS Ultra 2 with RAIDiator
4.2.19.
A few months ago I installed Triode's Spotify-plugin, and it has worked
fine ever since. But today it wouldn't play from Spotify and I got a
message on the Duet controller's screen: 'Unable to play...'
I ran a test from the plugin in LMS and got the message 'Helper app not
running' (even if the status said 'running'). Didn't know what to do, so
I restarted the NAS and LMS and tried again. Helper app still not
running. Unchecked and removed the Triode Spotify plugin from LMS. My
idea was to reinstall it again afterwards.
But now Triode's Spotify plugin is missing from the plugins list
(active as well as inactive)! I can only see the official Spotify
plugin, the one not made for Duet. (A big mistake by someone, if you
ask me.)
If I tick the box 'Show all third party plugin modules' and klick
'Apply' I get these messages in the top of the plugins tab window:
Corrupt repository
http://www.mysqueezebox.com/public/plugins/logitech.xml - Couldn't
resolve IP address for: www.mysqueezebox.com
Corrupt repository
http://triodeplugins.googlecode.com/svn/trunk/repo.xml - Couldn't
resolve IP address for: triodeplugins.googlecode.com
Corrupt repository
http://www.mysqueezebox.com/public/plugins/repository.xml - Couldn't
resolve IP address for: www.mysqueezebox.com
And if I enter http://triodeplugins.googlecode.com/svn/trunk/repo.xml
in the 'Additional repositories' field and click 'Apply' I get the same
messages.
These messages comes back every time I go to the plugins tab.
Can someone please help me out of this mess? I'm not an advanced
computer user, so please keep it simple (if possible).

[Triode]

The errors are related to the network not to the plugin list. Suggest
you reboot your router and then your server to see if this resolves
them. [the problem is the server can't find the list of plugins on the
internet]

[oskaalb]

You were right! After a few restarts with no results, I discovered that
the default gateway field in the NAS' config screen was blank. (Don't
know why.) Entered the correct gateway ip address and the plugin list
in LMS was okay again. Thank you for having guided me in the right
direction!