How to check Time synchronization for domain controllers? - windows

Question

I am trying to write a PowerShell script to alert me if one of the domain controllers goes out of sync via an email, I tried to run the script, but I had a problem with sending the email, here is the code. Could you please help me and tell me what is missing in my code? I did not receive any email, so how can I send the script results to my email?
function Get-Time {
<#
.SYNOPSIS
Gets the time of a windows server
.DESCRIPTION
Uses WMI to get the time of a remote server
.PARAMETER ServerName
The Server to get the date and time from
.EXAMPLE
PS C:\> Get-Time localhost
.EXAMPLE
PS C:\> Get-Time server01.domain.local -Credential (Get-Credential)
#>
[CmdletBinding()]
Param(
[Parameter(Position=0, Mandatory=$true)]
[ValidateNotNullOrEmpty()]
[System.String]
$ServerName,
$Credential
)
try {
if ($Credential) {
$DT = Get-WmiObject -Class Win32_LocalTime -ComputerName $servername -Credential $Credential
} else {
$DT = Get-WmiObject -Class Win32_LocalTime -ComputerName $servername
}
} catch {
throw
}
$w32tm = Invoke-Command -Computer $Servers -ArgumentList $Servers -Scriptblock {
Param ($Servers)
foreach ($Server in $Servers) {
$Check = w32tm /monitor /computers:$Server /nowarn
$ICMP = (($Check | Select-String "ICMP")-Replace "ICMP: " , "").Trim()
$ICMPVal = [int]($ICMP -split "ms")[0]
$Source = w32tm /query /source
$Name = Hostname
switch ($ICMPVal) {
{$ICMPVal -le 0} {$Status = "Optimal time synchronisation"}
#you probably need another value here since you'll get no status if it is between 0 and 2m
{$ICMPVal -lt 100000} {$Status = "0-2 Minute time difference"}
{$ICMPVal -ge 100000} {$Status = "Warning, 2 minutes time difference"}
{$ICMPVal -ge 300000} {$Status = "Critical. Over 5 minutes time difference!"}
}
$String = $Name + " - $Status " + "- $ICMP " + " - Source: $Source"
Write-Output $String
}
}
$Servers = "localhost","DC001"
$Servers | Foreach {
Get-Time $_
$results = foreach ($Server in $Servers) {
Get-Time $Server
}
$Servers = "localhost","DC001"
$From = "abc#company.com"
$To = "abc#company.com"
$Cc = ""
$Subject = "Time Skew Results"
$Body = $Servers | ConvertTo-Html | Out-String
$SMTPServer = "imail.company.com"
Send-MailMessage -From $From -To $To -Subject $Subject -Body $Body -SmtpServer $SMTPServer -BodyAsHTML
}
}

Answer 1

I wrote the code again and it works now, here is the code:
$w32tm = Invoke-Command -Computer $Servers -ArgumentList $Servers -Scriptblock {
Param ($Servers)
Foreach ($Server in $Servers)
{
$Check = w32tm /monitor /computers:$Server /nowarn
$ICMP = (($Check | Select-String "ICMP")-Replace "ICMP: " , "").Trim()
$ICMPVal = [int]($ICMP -split "ms")[0]
$Source = w32tm /query /source
$Name = Hostname
Switch ($ICMPVal)
{
#{$ICMPVal -le 0} {$Status = "Optimal time synchronisation"}
#{$ICMPVal -lt 100000} {$Status = "0-2 Minute time difference"}
{$ICMPVal -ge 100000} {$Status = "Warning, 2 minutes time difference"}
{$ICMPVal -ge 300000} {$Status = "Critical. Over 5 minutes time difference!"}
}
if ($ICMPVal -gt 100000)
{
$String = "The Domain Controller: " + $Name + " has " + " - $Status " + " - $ICMP " + " - Source: $Source"
$From = "abc#company.com"
$To = "abc#company.com"
$Cc = ""
$Subject = "Time Synchronization Alert "
$Body = Write-Output $String
$SMTPServer = "imail.company.com"
Send-MailMessage -From $From -To $To -Subject $Subject -Body $Body -SmtpServer $SMTPServer -BodyAsHTML
}
}
}
$w32tm