Adds last Public IP from the list of allowed IPs in NSG for RDP

Remove-PublicIPFromNSG.ps1

$SubscriptionName = ""
$RGName = ""
$NSGName = ""
$RuleName = ""

# Ensure Azure modules are installed
if (-not (Get-Module -ListAvailable -Name Az.Network)) {
    Install-Module -Name Az.Network -AllowClobber -Scope CurrentUser
}

# Log in to Azure (manual intervention might be required)
if (-not (Get-AzContext)) {
    Connect-AzAccount
}

# Set the subscription context using SubscriptionID
Set-AzContext -SubscriptionId $SubscriptionID

# Get the current public IP address
$publicIp = Invoke-RestMethod http://ipinfo.io/json | Select-Object -ExpandProperty ip

# Fetch the NSG
$NSG = Get-AzNetworkSecurityGroup -Name $NSGName -ResourceGroupName $RGName

# Fetch the current inbound security rule
$rule = Get-AzNetworkSecurityRuleConfig -NetworkSecurityGroup $NSG -Name $RuleName

# If the IP is present in the list, we'll remove it
if ($rule.SourceAddressPrefix.Contains($publicIp)) {
    $rule.SourceAddressPrefix.Remove($publicIp)
}

# Update the NSG rule and capture potential errors
try {
    $NSG | Set-AzNetworkSecurityGroup -ErrorAction Stop
    Write-Output "Removed $publicIp from the inbound rule $RuleName for RDP connection successfully."
}
catch {
    Write-Output "Failed to remove $publicIp from the inbound rule $RuleName for RDP connection. Error: $($_.Exception.Message)"
}