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How do you resolve all network connectivity issues?

To resolve all forms of network connectivity issues in a home or business setting, please perform the following steps in chronological order:
  1. On the Switch: Identify the cable that connects the Router to the Switch.  What port number is this cable plugged into on the switch?  Does this port number have a link light on the switch?  The link light only confirms that a cable is connected.  You must determine that the cable with the link light is the cable that connects the Router to the Switch.

  2. On the Switch: Identify the cable that connects the Computer to the Switch.  What port number is this cable plugged into on the switch?  Does this port number have a link light on the switch?  The link light only confirms that a cable is connected.  You must determine that the cable with the link light is the cable that connects the Computer to the Switch.

  3. On the Computer: Check the network adapter link light for the cable that connects the computer to the network switch.  The link light only confirms that a cable is connected.  You must determine that the cable with the link light is the cable that connects the Computer to the Switch.

  4. On the Computer: Check the Control Panel - Network Adapter Settings.  Is this computer set to DHCP?

  5. On the computer, go to Start - Run.

  6. Type: cmd

  7. Hit Enter.

  8. Type: ipconfig

  9. Hit Enter.

  10. Is this computer obtaining an IP Address?  You may need to type ipconfig /release and then ipconfig /renew.  You may also need to type ipconfig /flushdns.

    If the computer is still not connected, the issue is very likely one of the following:

    • Power Off/Power On Hardware.  All network equipment including the Router, Switch, Computer and all other devices should be turned off and turned back on.

    • Cabling issue.  Perhaps all cables are not properly connected.  Disconnect and then reconnect all cables.  In some instances, you may obtain a link light but the cabling is defective and therefore TCP/IP does not traverse the network properly.  Try re-crimping the cabling or replacing the cabling.  You may require the assistance of a professional cabling company.

    • Bad port on Switch.  Isolate the cable that runs from the Router to the Switch.  On the Switch: Try changing the cable from the existing port to another port.

    • On the computer, the Control Panel - Network Adapter has been set to Disabled in Control Panel - System - Device Manager.

    • On the computer, the Control Panel - Network Adapter - TCP/IP Protocol may be unchecked/disabled.

    • On the computer, the Control Panel - Users - User Account Control may be preventing the DHCP Client from functioning properly.

    • There is a competing DHCP Server on the network.  A DHCP Server is Enabled in a Router or other device on the network that is competing with your actual DHCP Server.  This is causing your actual DHCP Server to not function properly.

    • On the computer, you may also wish to set a Static IP Address in order to perform ping, tracert and other commands to test the network connectivity.  Can you ping the router/gateway from the computer?  If you can, the issue may be that the DHCP Server has been disabled in the Router.

    • If the computer is infected with a virus, you may have to perform the command: netsh winsock reset, netsh int ip reset c:\resetlog.txt, netsh winsock reset catalog.

    • Defective Hardware.  You may have a defective network adapter or defective switch that is preventing your computer network from functioning properly.  If you have determined that the cabling is properly connected between the devices - and have performed the troubleshooting methods listed above, you may have to isolate the hardware device that is creating the issue.  If it is a switch, try connecting to the switch directly using a laptop.  Is the network now functioning properly?  If not, you may need to replace the switch.  Try temporarily replacing the switch with a working switch to see if the problem is resolved.
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