Can't connect to wireless router with full signal strength?

We have a D-Link dir-601 router that worked for everything. Mysteriously, my xbox and my iphone can't connect to it, when at one point could always connect to it. My laptop and my sisters phone can connect and get internet. My xbox couldn't connect so to test it, I logged my iphone out of the wireless network and tried to reconnect but now it can't. Anyone know the deal? Wireless router seems to be playing favorites haha. I've done all the basic things like resetting the internet, sitting right next to the router, etc. In both devices that don't connect, it shows full signal strength from the router, just it can't connect to it.

Added (1). When I said reset, I mean like unplugging the power cord from the modem and router, waiting 30 seconds and replugging it back in.

What do you mean by resetting the internet? Have you used the reset button pin hole on the router and reset it and then unplug dsl/cable modem and router. Plug in modem wait till link lights are there then plug in router? If so not sure could be a bad router maybe try a new one, not seen that but once and it was an older laptop that would throw everyone off the router when it connected but it was just the type of router but that doesn't seem to be your issue since you have had it connected before. Unless you changed the router not sure but to reset it and if so then replace it and see. If it still does it maybe contact your isp. You can always take back the router after you switch it.

***Then do what i said earlier push the reset on your router with a paperclip it does a reset. ***

  • Wireless router experiencing problems when an Apple device connects via wireless? We have a home router (CD-R King brand), everything runs smoothly until someone with an apple device connects to the network. I tried pinging google continuously, but when an ipad or iphone connects. The network goes down. i've heard this problem from a friend.what's causing this problem?
  • Unable to connect Iphone or Ipod to wireless router? I have a Belkin Wireless Router and it easily connects the main computer and my laptop to the network but with Iphone and Ipods it doesn't connect. The network appears up on the ipod and the password i enter is definitely right but it says that its unable to connect. Any ideas on how to fix it? And if its technical please try make it as easy to understand as possible!
  • Question about using a wireless router wired and wireless? I was wondering with a wireless router can i hook up my mac and ps4 wired from the wireless router while also using my iphones and ipad wireless from same said router?
  • My iPhone suddenly has weak Wi-Fi signal strength? This has been going on for about a week now and it happened suddenly. My 3GS suddenly has terrible Wi-Fi signal strength, meaning that if I'm in my room now, I can't get Wi-Fi while sitting on my bed. I have to be on the same floor basically as my router. Is there something I can do? Is there dust blocking something? Tips please?