Your computer connects to the access point via a wireless connection.
Your access point connects to your router or other networking device via an Ethernet cable.
Your router connects to your cable or DSL modem via an Ethernet cable (your router and modem may be contained within a single device).
Your cable or DSL modem connects to your Internet Service Provider (ISP) via your cable or phone network.
Your Internet access might be failing within any of these devices or in any of the connections between them. To solve the problem, you need to identify the device or connection that is causing the failure and then correct the failing condition. Perform the following procedures to locate and correct the problem:
Check the indicator lights.
Verify the connection between your computer and the access point.
Verify the connection between the access point and your other networking device.
Check the indicator lights of all networking devices between the computer and the point where Internet service enters the building. If one or more of these devices indicates a problem, see the documentation for that device to return it to normal operations. On the access point, the following LEDs should be on: (power, WLAN, and LAN).
Run your wireless adapter utility. Does it report a successful connection to your access point?
If your wireless utility reports a successful wireless connection, your computer may be connected to a neighbour’s access point instead of yours. Use your wireless utility to check the Network name (SSID) of the access point you’re connected to. If the wireless adapter is connected to the wrong access point, use the utility to force your computer to connect to your access point (see the documentation for your wireless adapter).
If you are connected to the access point and still do not have access to the Internet, verify that the access point is responding by logging in to the configuration pages.
See "For wireless connections" in the basic troubleshooting procedure.
If you have enabled MAC filtering on the access point, make sure that your wireless adapter is permitted to connect to the access point. Note that MAC filtering refers to specific wireless adapters. If you use MAC filtering and have changed wireless adapters, you must add the MAC address of the new wireless adapter to the MAC filtering list on the access point.
On the device to which the access point is connected by ethernet cable, check the power and status LEDs. Verify that the device is powered on and connected to the Internet. Refer to the device's documentation for information on its status indicators.
If the access point is configured to get an IP address dynamically, make sure that the networking device has a DHCP server running.
If the access point is connected directly to your modem, check the modem documentation to determine whether the access point needs to have a static IP, gateway, and DNS entries or will get the network address using DHCP; then make sure that the access point is configured accordingly.
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