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My wake on lan stopped working for no apaprent reason.

I installed wireshark and from another machine sent a magic packet to the target computer and I could see the packet was coming through. Nothing in the BIOS changes, so

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I installed wireshark and from another machine sent a magic packet to the target computer and I could see the packet was coming through.

No changes were made to the BIOS, however after resetting the CMOS WOL started working again.

To reset the CMOS, check your motherboard manual. First take some pictures of your current BIOS setting in case you need it later. To reset the CMOS usually involves the following:

  1. Unplugging the power from your machine (important!!!)
  2. Moving jumper pins on your motherboard from pins 2-3 to pins 1-2 for about 10 seconds.
  3. Move the jumper back to pins 2-3.
  4. Reboot and reconfigure your BIOS
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There are a few questions that should be answered before properly diagnosing the issue.

  1. What OS are you using?
  2. Do you have any Firewalls in place? (see this from Microsoft about obstructions in your network that could be causing issues)
  3. Are you using the built-in Wake On Lan features of the OS?

I know many folks are using 3rd party Wake on LAN programs, any of these Wake on lan programs will work well and are Free to Download/Use commercially, as long as your firewall is configured properly, there isn't much to it.

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