LAN Connection

Suppose in a LAN, if one host does not get connection, what problem could have occured?

Questions by maung

Showing Answers 1 - 8 of 8 Answers


  • Sep 20th, 2008

No connectivity will concer with both Physical & logical problems.
Just check will it properly connected via Cables, Connector & lan Cards.
Then check is it in same subnet (TCP/IP configruration) & workgroup.

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Here are some tips

check LAN card driver it’s proper install or not
check LAN card it’s enable or disable (always enable)
check IP address, subnet mask, machine name and work group
check LAN security in O/S firewall it’s stated on higher you change lower
check LAN cable, IO port and switch/hub port
check BIOS setting - LAN card enable or disable (always enable)

All parts and settings checked ok, ping another machine in network it’s
replayed or not,
Check your machine and network for virus with updated antivirus.

Following are the troubleshooting steps that could be tried

1) Check the
IP first (Start --> Run --> cmd --> ipconfig).
If you get Windows IP configuration message after entering ipconfig,
check for the network adapter status in device manager (Start --> run --> devgmgmt.msc).

Ping ( which is a Public DNS Server) if you get replies DNS resolution  is not the problem.

If it fails try ipconfig/flushdns and then ipconfig/registerdns.

3) Ping --> If it times-out, try netsh winsock reset catalog,
Reboot the pc.

4) If the above steps do not work you will need to uninstall and reinstall the TCP/IP stack.


  • Jul 11th, 2009

Sometimes the problem persists in the Type of Cable. 

Whether it is a cross cable or a straight cable. 
Sometimes the LAN is connected in the computers, but will not be able to ping the system.

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  • Jun 21st, 2010

There can be more than one reason for the host not connecting to the network.

Check the following:-

1. Network adapter drivers (remove the driver and reinstall)
2. UTP cable from the switch/IO box (must be a straight cable)
3. RJ-45 Pins perfectly crimped at both the ends of the cable
4. Auto-negotiation of the speed between the switch and the ethernet card (10/100/1000).
5. DHCP client service (must be enabled and set to automatic to get the IP lease) if there is a DHCP server for the LAN
6. If there is no DHCP server, check Static IP Address and gateway
7. Some cases viruses and worms take control on the TCP/IP functionality. such cases scan the computer with latest AV signatures and remove the infection
Most of the cases can be solved checking the above 7 possiblities.


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  • May 24th, 2011


If one host in LAN does not connect to LAN check if the

1)Domain Name is entered correctly as it is case sensitive .
2)Check If Lan Card is working properly.
3)Check if the cable is clamped properly.
4)Check if the hub or switch is working properly.

To check if the Lan Card is working properly ping if the ping request is successful then the Lan Card is working properly.Likewise check for other listings.

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