I just wanted to share a small simple Powershell Watchdog that I made for some remote machines so that in case that ethernet port goes down or IP is not reachable it performs some actions …

It will do the following (you can change / modify everything):
I am triggering/running it with Task Scheduler every minute (you can change that to a longer period) – after system startup and it will run for an infinite period.

Script will try to ping 1.1.1.1 and if all packets are received back it will just wait for next cycle (in my case 1 minute). If packet is lost it will try to cycle network adapter by putting it down, wait 5 seconds and bring it back up.
After that it will wait for 10 seconds and it will retry to ping – if ping is still not going it will try to reboot the operating system.

Simple Powershell ps1 script looks like:

if (Test-Connection 1.1.1.1 -Quiet)
{ write-host "Connection is UP - nothing to worry about... :)" }
else
{ 
Disable-NetAdapter NAMEofTHEadapter -Confirm:$false
Sleep -Seconds 5
Enable-NetAdapter NAMEofTHEadapter -Confirm:$false
write-host "Network cycled"
sleep -Seconds 10
if (Test-Connection 1.1.1.1 -Quiet)
{ write-host "After cycling network adapter connection is bac UP - nothing to worry about... :)" }
else
{Restart-Computer -Force}
}

I have saved this script into c:\watchdog\watchdog.ps1 and created an task in Task Scheduler that runs this script on system startup and repeats every 1 minute for infinite amount of time …

Security options I have set to:
Run wether user is logged on or not
Do not store password.
Run with highest privileges

Action is to run: Powershell with Argument: -ExecutionPolicy ByPass -File C:\watchdog\watchdog.ps1