Does that URL return results if you put it in your browser?
I’ve never personally used SpotWeb and they make it hard given most of the documentation is not in English, but since it says it supports newznab and thats a valid newznab query it should work.
I get this when I try either of the two URLs (one from my post, one from your post):
Not Found
The requested URL /api was not found on this server.
http://192.168.1.140/spotweb/ is up; just checked - Spotweb’s working great. The API is current, I just checked. I gave more rights (‘administrator’) to that user; no change.
Spotweb Index
Spotweb Index API Results
http://192.168.1.140/spotweb/
en-gb
myemail (me me2)
http://192.168.1.140/spotweb/images/spotnet.gif
Spotweb Index
http://192.168.1.140/spotweb/
SpotWeb Index API Results
Breaking Bad S03E05 en S03E06 NL Subs 720
KQN8oJk5sPQSDxHUg2q9l@spot.net
http://192.168.1.140/spotweb/api?t=g&id=KQN8oJk5sPQSDxHUg2q9l@spot.net&apikey=75df3ba9a49dc525dfdd4068a66a3afb
Sat, 28 Sep 2013 22:30:02 +0200
Image > x264HD
…and lots of results of shows, in similar XML format…