Windows 7 may fail to connect to the Internet after being in sleep mode for any number of reasons. The issue could be with the computer's hardware, the operating system or the router that connects your computer to the modem and the Internet. In most cases, the steps required to fix your computer will require an internet connection, although you can do some without. If you're using a wireless connection, make sure you try connecting with a cable as well. In many cases, a wired connection will work when a wireless connection won't.
Instructions
1. Configure Your Network Adapters
Expand the Start Menu and type "Device Manager" in to the Start Search. Select "Network Adapters."
Right click on "Local Area Connection" and select "Properties."
Uncheck the box for "Internet Protocol Version 6 (TCP/IPv6)."
Select "Internet Protocol Version 4 (TCP/IPv4)" and click the Properties button below it. A new dialogue window will open.
Ensure that "Obtain an IP address automatically" and "Obtain DNS server address automatically" are both selected. Click "OK."
Find the button labeled "Configure..." and click on it. The Local Area Connection, Properties window will close and a new one will open.
Navigate to the "Drivers" tab and click on "Update Driver." If you currently have an Internet connection, this will automatically connect to Microsoft's database of drivers. It will download and install the latest version, if any exist. When it's finished, click "OK." If the computer asks you to reboot, click "No" and manually reboot later when you've completed these instructions.
Repeat for any other connections you have, such as wireless connections or secondary LAN connections.
2. Configure WLAN Settings
Click on the Start Menu and select "Run." Type in "services" and press enter. This opens the Services window.
At the bottom of the list, find "WLAN AutoConfig" and right click on it. Select "Properties."
Set the Startup type to "Automatic" and click "Start." Press "OK" and close the Services window.
3. Configure Your Router
Navigate to your router's setup page if you have one. In most cases, you can access the setup page by typing the following into your web browser: "//192.168.0.1" and pressing "Enter."
At the very top of your router's setup page should be a drop-down. Make sure it is set to "PPoE" and in the options below it "Keep Alive" is selected. Save any changes. For this setting to work, you may need to contact your ISP about setting your modem to accept the router's attempts to connect.
Locate the Wireless Security page if you have DSL, which is indicated by a phone plug. If you are using WPA2 security, make sure the WPA Algorithm is set to "TKIP+AES." Again, save any changes. Look at where your setup connects to the wall. If the plug is a round cable like the kind that connects to your TV, you can skip this step.
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