Hey,
With out knowing how the Wifi network is setup i cant really give you a specific answer...but i can give you some technical insight. Here are some examples of how the landlord could be limiting/stopping your internet connection:
1.) Disconnecting the phone line from the Wifi router - This will also effect your landlord as well as yourselves.
2.) If your landlord is technical he could stop any traffic from accessing the outside apart from himself - This would involve him to place his machine on a static ip and also configuring the router to only accept his ip/mac to the outside. Where as your self will connect to the router but will not be able to get any further.
Above is a technical and non-answer of how he could be stopping you from gaining your internet rights. I personally reackon it could be you ISP (Internet Service Provder) hense the router still being on and you still being able to connect to it. You can rule out ISP by doing the following below:
Press "Start"
Click on "Run"
Type in "cmd"
Then press enter
then type inside the black box (Command Prompt) "ping www.google.com"
See if you get a reply.....it should say the following:
Pinging www-tmmdi.l.google.com (**.**.**.**) 56(84) bytes of data.
Reply from **.**.**.**: bytes = 32 time=23ms TTL=47
(or somthing like that)
If you get the following reply or similiar below then you have an outside connection but there maybe some foul play on your router. If you dont get a reply but you get a DNS reponse which is the following:
Pinging www-tmmdi.l.google.com (**.**.**.**) 56(84) bytes of data.
Request timed out.
Request timed out.
Then there still maybe foul play happening on the Wifi network :-)
But if you get the following exmaple shown below:
Pinging www.google.com with 32 bytes of data:
Request timed out.
Request timed out.
I would probably say its to do with the ISP and your landlord is not at fault.
I hope i havnt techified you but if you need anything else or a better explanation then let me know :-)