Unable to access internet

I HOPE IT HELPS, GOOF LUCK.

Example: Changing DNS server settings on Microsoft Windows 7

1. Go the Control Panel.
2. Click Network and Internet, then Network and Sharing Center, and click Change adapter settings.
3. Select the connection for which you want to configure Google Public DNS. For example:
   • To change the settings for an Ethernet connection, right-click Local Area Connection, and click Properties.
   • To change the settings for a wireless connection, right-click Wireless Network Connection, and click Properties.
   If you are prompted for an administrator password or confirmation, type the password or provide confirmation.
4. Select the Networking tab. Under This connection uses the following items, select Internet Protocol Version 4 (TCP/IPv4) or Internet Protocol Version 6 (TCP/IPv6) and then click Properties.
5. Click Advanced and select the DNS tab. If there are any DNS server IP addresses listed there, write them down for future reference, and remove them from this window.
6. Click OK.
7. Select Use the following DNS server addresses. If there are any IP addresses listed in the Preferred DNS server or Alternate DNS server, write them down for future reference.
8. Replace those addresses with the IP addresses of the Google DNS servers:
   • For IPv4: 8.8.8.8 and/or 8.8.4.4.
   • For IPv6: 2001:4860:4860::8888 and/or 2001:4860:4860::8844

The Google Public DNS IP addresses (IPv4) are as follows:

• 8.8.8.8
• 8.8.4.4

The Google Public DNS IPv6 addresses are as follows:

• 2001:4860:4860::8888
• 2001:4860:4860::8844

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1. IPConfig is a tool built into Windows, that displays all current TCP/IP network configuration values and refreshes Dynamic Host Configuration Protocol DHCP and Domain Name System DNS settings. You can access this tool via the command line. If you have a bad IP address, then renewing your IP address this way may help solve your internet problems.

Type cmd in start search and press Ctrl-Shift-Enter. If you wish, just out of curiosity, you may type ipconfig and hit Enter, to view the status of the computer’s Internet Protocol or IP address.

Type ipconfig /release to let go of the current IP address.

Next type ipconfig /renew to obtain a new IP address.

If you get an error Message When You Run the “Ipconfig /Renew” Command see KB810606.

If you recurrently face this problem, then you can have it renewed on every start-up, by creating the following .bat file and placing it in your startup folder.

Open notepad and type:

ipconfig /release
ipconfig /renew

Save it as, say, iprenew.bat file.

2. Frequently, internet connection problems can also be traced to a corrupted DNS cache. Resetting or Flushing this cache is an easy fix to many of these problems. This is how to clear the DNS cache in Windows 7 or Vista.

ipconfig /flushdns

You should be able to see a confirmation dialog window:

Windows IP Configuration. Successfully flushed the DNS Resolver Cache.

Next type ipconfig /registerdns and hit Enter.

This registers any DNS records that you or some programs may have recorded in your Hosts file.

Just in case you are interested, to view the complete syntax for this command type ipconfig /help and hit Enter!

3. The Network & Internet Diagnostic & Repair Tool in Windows 7 & Vista will help you identify the potential issues preventing network connectivity, and it automatically takes appropriate steps toward correcting them. If a computer on the network loses Internet connectivity, you can graphically see which connection is down and then use Network Diagnostics to help determine the cause of the problem and find possible solutions.

To access it, open Control Panel > Network & Sharing Center. In the lower part, click on Troubleshoot Problems. From the windows which opens, you can select Internet Connections or any other issue you want to troubleshoot and repair.

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Troubleshooting steps to try first

Follow these steps to solve most problems with a wireless network and Internet connection. Test the connection after performing each step. If the problem is not fixed, continue to the next step.

Step 1: Turn on wireless using the wireless keyboard key or button (notebooks only)

Most notebooks have a wireless keyboard key, switch, or a button on the case that turns the wireless network device on or off. In some cases, the wireless keyboard key or button might be inadvertantly disabled by an accidental press. The wireless button or switch is usually found as one of the F keys on the keyboard or as an illuminated button above the keyboard.

Figure 1: Example of a wireless keyboard key (yours may be different)

An indicator light ( ) glows blue when the Bluetooth or WiFi communication devices are turned on. If the computer has both Bluetooth and WiFi and one of them is turned off or the device is disabled, the light glows amber. The indicator light does not glow at all when power to the device is turned off. Use the HP Wireless Assistant software to enable or disable the individual wireless functions.

Step 2: Reset power to the network router and cable or DSL modem

When a computer establishes a connection with a router or with the Internet, it uses several IP addresses to manage the communication. If the electrical power to the computer, the router, or the Internet service is interrupted momentarily, the IP address might change and disrupt the connections. The indicator lights on the equipment might indicate that a connection exists, but the IP addresses might not be correct. To re-estabish the correct IP addresses, reset the power as follows:

1. Completely shut down the computer. Click Start , and then click Shut Down .
   Figure 2: Shutting down the computer

   
2. Unplug the power to the wireless router and to the cable or DSL modem.
   Figure 3: Unplugging the power cord from the back of a router

   
3. Wait at least 30 seconds before continuing.
4. Reconnect the power to the modem and allow it to re-establish a connection to the ISP. If the modem has indicator lights, wait until the lights indicate a connection.
5. If using a separate wireless router, reconnect the power to the router and allow it to re-establish the connections to the modem and other components.
6. After the modem and router have finished making connections, turn on the computer.
7. Click the Network Connection icon in the notification area and click Connect next to the name of the wireless network.
   If the network name is not displayed, click the Refresh button to scan for wireless network signals.

Step 3: Use Windows 7 diagnostic and troubleshooting tools

Windows 7 includes a network diagnostic tool and a network troubleshooter. Both tools help to identify network problems and provide possible solutions.

Run Windows Network Diagnostics

Windows 7 monitors the network and Internet connections. If it detects a problem, Windows 7 displays a no connection or limited connection message, and prompts you for permission to diagnose the problem. Click OK to allow Windows 7 to diagnose the problem and restore the connection.

To run the diagnostic tool manually, use one of the following options:

No error message is displayed, but there is no Internet connection:
Right-click the Network Connection icon in the notification area, and then click Troubleshoot problems . Windows Network Diagnostics checks for problems.
Figure 4: Troubleshoot problems

The Network Connection icon is missing in the notification area:
1. Click Start , and then type network and sharing in the Search box. Click Network and Sharing Center in the results.
   Figure 5: Opening the Network and Sharing Center from the Start menu

   
2. In the Network and Sharing Center, click the yellow exclamation symbol or the red X in the Network status area to run Windows Network Diagnostics.
   Figure 6: Network status

   

Use the Windows 7 Network and Internet Troubleshooter

The Windows 7 Network and Internet Troubleshooter tests the network for problems and automatically repairs the network connections if applicable. Use this tool to test and repair the connection:

1. Click Start , and then type network and sharing in the Search box. Click Network and Sharing Center in the results.
   Figure 7: Opening the Network and Sharing Center from the Start menu

   
2. Click Troubleshoot problems .
   Figure 8: Troubleshoot problems

   
   The Network and Internet Troubleshooter opens.
3. Click Internet Connections to test the Internet connection.
   Figure 9: Network and Internet Troubleshooter

   
4. Follow the instructions to check for problems.
5. If the problem is resolved, you are done.
   If the problem continues, return to the Network and Internet Troubleshooter and click Network Adapter to test the adapter.

Step 4: Manually connect to the wireless network

A common problem with a lost connection or poor network connectivity is accidental connection to the wrong network. It is possible to connect to a network that does not actually exist. For instance, an interruption in the power to a router or a modem, or a momentary loss of signal from the ISP. These types of problems can be resolved by disconnecting from the network router and manually re-establishing a new connection.

Use the following steps to disconnect from a wireless network, and then search for, and manually re-connect to the desired wireless network.

1. Click Start , and then type network and sharing in the Search box. Click Network and Sharing Center in the results.
   Figure 10: Opening the Network and Sharing Center from the Start menu

   
2. In the Network and Sharing Center window, click Set up a new connection or network .
   Figure 11: Set up a new connection or network

   
   

   NOTE:Do not click Connect to a network . If the problem is an incorrect password or key index, this option reconnects with the wrong information.
3. In the Choose a connection option window, select Manually connect to a wireless network , and click Next .
   Figure 12: Manually connect to a wireless network

   
4. Type the required wireless network information, and then click Next .

   Network name
   Security type - Must be the same security as set in the wireless router.
   Encryption type
   Security Key
   Select Start this connection automatically
   Select Connect even if the network is not broadcasting
   Figure 13: Network information

   
   

   NOTE:If the wireless network already exists, when prompted, select Use the existing network . The information just entered replaces the previous values that are causing the connection problem.
5. Click Close .
   Figure 14: Successfully added network

   
6. Click the Network Connection icon in the notification area, click the name of the new network, and then click Connect .

Cannot connect to the wireless network or to the Internet

If the computer has been connected to your home wireless network in the past, and had access to the Internet, but now it cannot connect to the wireless network or Internet or displays a limited access message, follow these steps to try to fix the problem.

Test the connection after performing each step. If the problem is not fixed, continue to the next step.

Step 1: Check the hardware and cables

Use the following steps to verify that your modem, adapter, and router and access points are turned on and connected correctly:

1. Check your cable or DSL modem for disconnected cables or wires. Make sure the power cable is connected and the lights are on.
2. Make sure that the wireless router is connected to the power adapter and modem. Make sure the lights are on.
3. Reseat all the cables and power cords.
4. Click the Network Connection icon in the notification area and click Connect next to the name of the wireless network.
   If the network name is not displayed, click the Refresh button to scan for wireless network signals.

Step 2: Make sure the wireless network device is turned on (Notebook computers only)

For the wireless network adapter to operate properly, you must perform two separate actions: turn on the power to the wireless device, and then enable the device to send and receive signals.

There are different ways to check the status of the wireless network and turn the wireless device on and off. If you use one of the methods to turn off your network device, you should use the same method to turn it back on.

For more information on a given step, click the heading or the accompanying plus (+) sign to expand the information.

Turn on device using the wireless keyboard key or button

Most notebooks have a wireless keyboard key, switch, or a button on the case that turns the wireless network device on or off. In some cases, the wireless keyboard key or button might be inadvertantly disabled by an accidental press. The wireless button or switch is usually found as one of the F keys on the keyboard or as an illuminated button above the keyboard.

Figure 15: Example of a wireless keyboard key (yours may be different)

An indicator light ( ) glows blue when the Bluetooth or WiFi communication devices are turned on. If the computer has both Bluetooth and WiFi and one of them is turned off or the device is disabled, the light glows amber. The indicator light does not glow at all when power to the device is turned off. Use the HP Wireless Assistant software when you want to enable only one of the two wireless functions (Wireless LAN or Bluetooth).

Turn on device using HP Wireless Assistant

Wireless devices can be turned on and off using the HP Wireless Assistant. This tool is designed to control the wireless LAN and Bluetooth devices individually. The wireless LAN can be turned on while the Bluetooth is turned off, or vice versa.

The action of the HP Wireless Assistant control is independent of the wireless device power switch. It is possible for the wireless device LED to glow blue because power is being sent to the device, although the device is turned off. By default, the HP Wireless Assistant is configured to display a wireless icon, either On ( ), or Off ( ) in the Windows notification area. However, the computer can be set to not display in the icons in the notification area.

HP recommends that the HP Wireless Assistant be configured to display the icons as follows.

1. Click Start , enter wireless assistant into the search field, and then select HP Wireless Assistant from the list.
   If HP Wireless Assistant is not installed, either:
   Click to download the latest version of HP Wireless Assistant .
   Or, go to Verify the status of the wireless network device using Windows Mobility Center .
2. Verify the status of the installed wireless devices. They should all be on.
3. Click Properties to open the Settings window.
4. Select the Show Wireless Assistant icon in the notification area option, and then click Apply . The icon displays in the system tray area.

You can now monitor the network at a glance by checking the wireless power LED ( ), the wireless LAN device icon ( ), and the network connection icon ( ).

NOTE:If the HP Wireless Assistant is not installed, it is available in the Network drivers section of the Support & Drivers page on hp.com.

Turn on the device using Windows Mobility Center

If you do not have HP Wireless Assistant installed on your computer and you do not want to install it, you can use the Windows Mobility Center to turn wireless devices on and off. Windows Mobility Center allows all wireless devices to be turned on or off at the same time—wireless LAN and Bluetooth devices cannot be turned off individually, as they can when using HP Wireless Assistant.

The action of the Windows Mobility Center control is independent of the wireless device power switch. It is possible for the wireless device LED to glow blue because power is being sent to the device, although the device is turned off.

To verify the status of the installed wireless devices, follow the steps below.

1. Click Start , enter mobility into the search field, and then select Windows Mobility Center from the list.
2. On the Windows Mobility Center window, this graphics shows the Wireless Network is Wireless off . Click Turn wireless on to turn on the device.
   
   Your wireless network device(s) are now turned on via Windows Mobility Center.

Step 3: Make sure the wireless network connection and network adapters are enabled

If the wireless network connection or network adapters are disabled, the computer cannot connect to the network. Follow the steps in both of the following sections to check the status of the network connection and adapters.

Make sure the network connection is enabled in Network and Sharing Center

A disabled network connection prevents the computer from connecting to the network. Follow these steps to check the status of the wireless network connection:

1. Click Start , and then type network and sharing in the Search box. Click Network and Sharing Center in the results.
   Figure 16: Opening the Network and Sharing Center from the Start menu

   
2. In the Network and Sharing Center, click Change adapter settings .
   The Network Connections window opens.
3. Check the status of the wireless network connection. If the network is disabled, right-click the connection, and then click Enable .
   Figure 17: Enable network

   
   It might take a few seconds to enable the connection.

Make sure the network adapters are enabled in Device Manager

Follow these steps to open Device Manager and check the status of the network adapter:

1. Click Start , and then type Device Manager in the Search box. Click Device Manager in the results.
   Figure 18: Opening Device Manager from the Start menu

   
2. Double-click Network adapters .
   Figure 19: Device Manager

   
3. Check the status of the wireless LAN hardware.
   If the icon next to the hardware has an arrow ( ), the hardware is disabled. Right-click the name of the hardware, then click Enable .
   Figure 20: Enable the wireless LAN hardware

   
   

   NOTE:If the wireless LAN hardware is not listed, click Action , then click Scan for hardware changes . If the hardware is still not listed, restart the computer, then return to Device Manager. Windows 7 automatically detects hardware and installs drivers upon system startup.

Step 4: Minimize interference and move the computer closer to the router

A wireless network router has a limited broadcast range. The further the computer is from the router, the weaker the broadcast signal. Solid objects, such as walls, metal furniture, and electrical appliances might interfere with the signal and decrease the usable range.

For testing purposes, move the computer closer to the router and minimize interference from electrical devices. If testing the connection with the computer near to the router proves that the wireless connection is working, you can move the computer to determine the range of the connection. To extend the usable range of the wireless network router, consider purchasing a different antenna from the router manufacturer, or use a signal repeater.

If the test fails with the computer and the router in the same room, continue to the next step to force the device to re-establish all connection values.

Step 5: Make sure that the computer is connected to the right network

When the computer detects a wireless network, if it has been connected to that network in the past, it tries to re-establish the connection. However, the connection might not be to the correct network.

To determine what network the computer is connected to and to select the network you want, do the following:

1. Click the Network Connection icon in the notification area see if any wireless networks are connected.
   If the computer is connected to an incorrect network, click the name of the network, then click Disconnect . Click the name of the correct network, then click Connect .
   Once the computer is connected to the correct network, check for Internet access. If the computer does not have Internet access or has limited access, go to Connect the computer directly to the network router using an Ethernet cable .

Step 6: Connect the computer directly to the network router using an Ethernet cable

Connect the computer directly to the network router using an Ethernet cable to determine if the connection problem lies with the router settings or with the wireless signal. It is not necessary to turn off the computer's wireless network device during the testing.

1. Move the computer closer to the router (if needed) and connect an Ethernet cable from one of the available ports on the router to the network port on the computer.
2. Right-click the Network Connection icon in the notification area, and select Network and Sharing Center .
3. Select Change adapter settings .
   Figure 21: Change adapter settings

   
4. Check the status of the Local Area Connection .
5. If the wired network, or the wireless network, is Disabled , right-click the connection, and click Enable . It might take a few seconds for the connection to become enabled.
6. Click the Back button to return to the Network and Sharing Center.
   If the Network and Sharing Center window shows connections from the computer to the network router, and from the router to the cable or DSL modem, click the Internet icon to open a Web browser and view a page on the Web. The router is configured.
   If the Network and Sharing Center window shows connections from the computer to the network router, but not from the router to the Internet, the router might not be configured correctly. See Reset and reconfigure the router .
   If the network router cannot connect to the Internet, and you have installed programs that required making changes to the firewall settings, refer to router manufacturer Help files for information on restoring the router to the factory default conditions.
7. After you have verified the direct wired connection to the Internet, turn on the power to the wireless device, disconnect the Ethernet cable from the computer, and manually setup a new connection to the wireless network (see Manually connect to the wireless network ).

Step 7: Reset and reconfigure the router

If you have installed a new router or made changes to the router settings while trying to fix connection problems, reset the router to its factory settings, then run the manufacturer set up program to configure the router.

Use the following steps as a general guideline, but see the User Guide for the router for model specific information.

1. Enter the default IP addresses for the router into the URL address field on the browser. The following list provides default IP addresses for several routers.
   3Com : http://192.168.1.1
   D-Link : http://192.168.0.1
   Linksys : http://192.168.1.1
   Netgear : http://192.168.0.1
   

   NOTE: These IP addresses are provided for informational purposes only.
2. When the home page for the router displays, you might need to type a password to perform configuration tasks. See the User Guide for model specific information.
   

   NOTE:Most manufacturers allow you to reset the router to a default factory condition and then open router configuration screens.
3. When you have administrator access to the router, change the router's default name, sometimes called an SSID, to a name that is different from other routers in your area.
4. Set up wireless encryption (WEP) or Wi-Fi Protected Access (WPA), to prevent other computers from connecting to your home network.
5. Enter a network access password, sometimes called a passphrase. Make sure to pick a password that is easy to remember, such as a phone number that you dial often or a phrase that is familiar.

Step 8: Check the router manufacturer's Web site for firmware updates

Outdated firmware can prevent the router from accessing the Internet or certain Web pages.

Step 9: Install updated WLAN Driver and BIOS

If no network connection icon is displayed within 15 to 30 seconds after enabling the wireless network, or if a Windows Device not Found error message displays, the software driver might be missing or corrupt. To fix this, download and install the latest drivers and BIOS from the HP Web site.

To get the updated wireless LAN adapter drivers and latest version of the BIOS for your computer, go to the HP Drivers and Downloads page and search for updated drivers. You must know the exact model number or product number for your computer. Be sure to select the correct operating system.

If the wireless adapter you are using was purchased separately, consult the manufacturer's Web site for the latest software.

NOTE:If the computer cannot connect to the Internet, use another computer to download the files to an external storage device. Install the updated drivers from external storage device.

Step 10: Perform a Microsoft System Restore

If the computer was able to connect to the wireless network in the past, but now cannot connect, perform a Microsoft System Restore .

If you have completed all the steps and still cannot connect to the wireless network, contact HP for support.