Update an Azure NSG for my current public ip address, start the virtual machine and launch remote desktop to the VM. Associated blogpost https://blog.darrenjrobinson.com/automating-source-ip-address-updates-on-an-azure-network-security-group-rdp-access-rule/

UpdatedNSGSourceIPRDPRuleStartVMandConnect.ps1

# My RG
$resourceGroup = "MyResourceGroup"
# VM that will be started after updating the NSG
$VMName = "MyVM"
# NSG Name
$NSGName = "MyResourceGroupNSG"
# RDP File
$RDPFile = "C:\Users\Darren\Desktop\MyVM.rdp" 

# Get my Public IP
$ip = Invoke-RestMethod http://ipinfo.io/json | Select -exp ip

# Login to Azure
Import-Module AzureRM
Login-AzureRmAccount 

# Get Sub Info and select Subscription
$SubscriptionName = Get-AzureRmSubscription | sort SubscriptionName | Select SubscriptionName, SubscriptionID
$SubscriptionName = $SubscriptionName.SubscriptionName
Select-AzureRmSubscription -SubscriptionName $SubscriptionName 
$SubscriptionID = $SubscriptionName.SubscriptionId

# Get NSG
$NSG = Get-AzureRmNetworkSecurityGroup -ResourceGroupName $resourceGroup -Name $NSGName
# Current IP in the RDP Rule
write-host "Current NSG RDP Rule IP is" $NSG.SecurityRules[0].SourceAddressPrefix 
write-host "Current External IP is" $IP 
# Updating to current external IP if different
if ($NSG.SecurityRules[0].SourceAddressPrefix -ne $ip) {
   Set-AzureRmNetworkSecurityRuleConfig -NetworkSecurityGroup $NSG -Name $NSG.SecurityRules[0].Name -SourceAddressPrefix $ip -Protocol * -SourcePortRange * -DestinationPortRange 3389 -Access Allow -DestinationAddressPrefix * -Priority 100 -Direction Inbound
   Set-AzureRmNetworkSecurityGroup -NetworkSecurityGroup $NSG 
}
# Start VM
$vm = Get-AzureRmVM -ResourceGroupName $resourceGroup -Name $VMName -Status 
$PowerState = (get-culture).TextInfo.ToTitleCase(($vm.statuses)[1].code.split("/")[1])
if ($PowerState -eq "Deallocated"){
    $vmstatus = Start-AzureRMVM -ResourceGroupName $resourceGroup -Name $VMName
}

# Connect to VM using RDP Settings File
if($vmstatus.Status.Equals("Succeeded")){
    Start-Process "$env:windir\system32\mstsc.exe" -ArgumentList $RDPFile
}
else{
    write-host "Something went wrong starting $VMName" -foregroundcolor "magenta" -backgroundcolor "yellow"
}

# Stop VM 
# Stop-AzureRMVM -ResourceGroupName $resourceGroup -Name $VMName -Force