1. Out of date firmware in the router.
2. SSID disabled (sometimes you don't have a choice but to leave it on.)
3. Interfering neighbors wifi. Hint: change your channel.
Best of luck,
Really hoping you can help, volunteered to set up a network/net connection for the 7 people in our house (never again), got 2 pcs I can't get online and have no idea why.
Have Dsl coming in through a router/built in switch, it has its own DCHP server and works fine when any pc is plugged directly into it.
One port is being used up by my PC, another by an access point. One goes to a switch upstairs running a few pcs that all work fine.
The problem is I have a line running downstairs that works perfectly when plugged directly into any machine. But if I go into a switch, then to the machine (any machine) i get about 20secs of xp searching for a connection then "limited or no connectivity".
I've tried everything I can think of: swapping the switch for the working one upstairs, another run of cat 5 from router to switch.Even tried converting it to a crossover lead, with made no difference being a switch and all. It's not the PC as it happens on 2 different desktops and my laptop:(
The only thing that showed any improvement was giving the machine a fixed IP/DNS servers, it seemed to connect ok, but still no network accesss.
Does anybody have any ideas? I work in IT and like to think I'm not a total mongoloid, but I'd love for somebody to point out the obvious:)