Diagnosing and resolving local area connection problems


Occasionally network cables can get unplugged or the network adapter might experience a problem that temporarily prevents it from working. After you plug the cable back in or solve the adapter problem, the connection should automatically reconnect. To diagnose local area connection problems, follow these steps:

  1. Click Start and then click Network. In Network Explorer, click Network and Sharing Center on the toolbar.
  2. In Network and Sharing Center, click Manage Network Connections.
  3. Right-click the connection you want to work with and select Diagnose.

Windows network diagnostics will then try to identify the problem. A list of possible solutions is provided for identifiable configuration problems. Some solutions provide automated fixes that you can execute by clicking the solution. Other solutions require manual fixes, such as might be required if you need to reset a network router or broadband modem. If your actions don't fix the problem, refer to other appropriate parts of this troubleshooting section.

Another Method

1. Open Your Computers Command Prompt
Click Start > Run > CMD
2. Ping Your NIC Card

At the command prompt type either of the following:

ping google.com > then press Enter
3. Check Your Results

You should get back results that look something like this:

Pinging google.com [] with 32 bytes of data:

Reply from bytes=32 time=66ms TTL=243
Reply from bytes=32 time=71ms TTL=243
Reply from bytes=32 time=80ms TTL=243
Reply from bytes=32 time=65ms TTL=243

Ping statistics for
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 65ms, Maximum = 80ms, Average = 70ms
4. Exit The Command Prompt

At the command prompt type exit and press Enter


Pinging (loopback) tests that your TCP/IP stack isn't corrupt.
Pinging your ip address address (e.g., tests if your NIC is functioning.
Pinging your gateway tests if your LAN is working.
Pinging an external address tests if routing and your internet connection are working.

Another Method

First you remove your network cable from both end and reinsert it and check it is working or not. Second you check the LED's in the both port(Means both end of cable)are blinking but netwok is not functioning properly. Both this steps are failed then follow this steps.

1. Right click on My Comutepr icon and click properties or simultaniously press Windows key + Pause Break keys in the keyboard to open System Properties.

2. In the hardware tab click Device Manager / newest version of windows the Device Manager is in the left top of the System Properties.

3. In the Device Manager expand the network adapters, it will display the installed network adapters in your computer.

4. If a red cross mark is displayed in your network adapter then right click on the adapter and click Enable from the popup menu.

4.1. If there is a Yellow circle is displayed in your network adapter then it means your driver is not properly installed. Uninstall the driver and install the right driver software for properly work your adapter.

4.2. If there is no network adapters displayed in the list, shutdown your computer. Power on your computer and go to BIOS settings mode( For entering BIOS settings mode press F2 or Del or F12 or F8 Key in the keyboard you can see the key details from the first screen after power on the system)Once you enter the BIOS settings mode you can go through the menus using the arrow keys. Read the contents in the screen to change the settings easily. Once you find Onboard Network Adapter/ Onboard Network check the value is enabled/disabled if disabled then change it to enabled and press F10 Key
 and press Y Key to save and exit from the BIOS and restart computer automatically.

4.3. It is not working after the above steps, check you have an onboard network adapter or a seperate network adapter is installed in an expansion slot. eg: PCI Card.

4.3. If it is onboard adapter then you need to purchase a PCI Network adapter and insert it into the PCI Slot or You are already using a PCI adapter then just change the adapter and Insert new adapter. Install the driver software to function the adapter working properly.

Importent settings of your network adapter

From the device manager right click your network adapter and click properties to open your network adapter properties window.

Tab : General

Make sure, that the "Device status" is:"This device is working properly".

if not, use the button "troubleshooting"

Tab: Advanced

Some network adapters allow to configure the connector to be used (in case of Combo adapters), and whether to use on Twisted Pair (TP) cabling "Full Duplex" (= receive and transmit at the same time) or "Half Duplex" (= receive OR transmit at a given time)

Tips:  Sometimes the network is connected properly but not send or recieve data. This time you change the duplex to Half Duplex and if the speed settings is available (eg: 10 Mbps/100 Mbps/ 1000 Mbps) change the speed to lowest and try to connect the network will solve the issue.

Tab : Driver

In case that Windows has problems using the driver, you can download from the manufacturer of the network adapter a new driver, which you can use then to "Update"

Tab: Resources

Under "Resource Settings", you will see the I/O-range and IRQ used/assigned by this component.

For PCI network cards, it is not possible to change the resources (I/O-range and IRQ ), but for ISA Plug & Play card you can assign
different settings (if you need to resolve a resource issue, but that should not be required, this should only be done by real  xperts )

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