function Set-SMSvcHostSids {
<#
.SYNOPSIS
	Checks to see if the SMSvcHost.exe.config contains permissions for SIDs for the DBMS and Micro accounts. Adds them and the containing xml nodes if not.
#>
    [CmdletBinding()]
    param(
    )

    $logLead  = (Get-LogLeadName);

    $configFilePath = "C:\Windows\Microsoft.NET\Framework64\v4.0.30319\SMSvcHost.exe.config"
    $dbmsAccountName = Get-AppSetting "DatabaseMicroServiceAccount"
    $dbmsSid = $null

    if($null -ne $dbmsAccountName)
    {
        $dbmsSid = Get-SIDFromUserName $dbmsAccountName
    }
    else {
        throw ("$logLead : Machine.config must have an appsetting value for the dbms account.")
    }

    $microAccountName = Get-AppSetting "NonDatabaseMicroServiceAccount"
    $microSid = $null

    if($null -ne $microAccountName)
    {
        $microSid = Get-SIDFromUserName $microAccountName
    }
    else {
        throw ("$logLead : Machine.config must have an appsetting value for the micro account.")
    }

    try {
        [Xml]$smSvcHostConfig = Read-XMLFile $configFilePath -ErrorAction SilentlyContinue
        if ([String]::IsNullOrEmpty($smSvcHostConfig)) {
            throw ("$logLead : The SMSvcHost.exe.config config file could not be found")
        }
    }
    catch {
        throw ("$logLead : The SMSvcHost.exe.config config file could not be read or is invalid.")
    }

    $configFileIsDirty = $false;

    $xmlBlock = [xml]"<system.serviceModel.activation>
    <net.tcp listenBacklog=`"10`" maxPendingConnections=`"100`" maxPendingAccepts=`"2`" receiveTimeout=`"00:00:10`" teredoEnabled=`"false`">
        <allowAccounts>
            <add securityIdentifier=`"$dbmsSid`" />
            <add securityIdentifier=`"$microSid`" />
        </allowAccounts>
    </net.tcp>
    </system.serviceModel.activation>"

    $xmlNodeNames = @(
        "system.serviceModel.activation",
        "net.tcp",
        "allowAccounts",
        "add"
    )

    $nullNodeName = $null;
    $knownParentNode = "configuration";
    foreach ($xmlNodeName in $xmlNodeNames) {
        if($smSvcHostConfig.SelectNodes("//$xmlNodeName").Count -eq 0)
        {
            $nullNodeName = $xmlNodeName
            break;
        }
        else {
            $knownParentNode = $xmlNodeName
        }
    }

    if(($null -eq $nullNodeName) -or ($nullNodeName -eq "add"))
    {
        $dbmsNode = $smSvcHostConfig.SelectNodes("//add[@securityIdentifier='$dbmsSid']")
        # test for existing sids
        # just 2 potential SIDs here, so not bothering with complex loop logic.
        if($null -eq $dbmsNode -or $dbmsNode.Count -eq 0 )
        {
            Write-Verbose ("$logLead : Dbms SID does not exist. New SIDs being added.")
            $configFileIsDirty = $true;

            $newNode = [xml]"<add securityIdentifier=`"$dbmsSid`" />";
            $smSvcHostConfig.SelectSingleNode("//allowAccounts").AppendChild($smSvcHostConfig.ImportNode($newNode.add, $true))
        }

        $microNode = $smSvcHostConfig.SelectNodes("//add[@securityIdentifier='$microSid']")
        if($null -eq $microNode -or $microNode.Count -eq 0 )
        {
            Write-Verbose ("$logLead : Micro SID does not exist. New SIDs being added.")
            $configFileIsDirty = $true;

            $newNode = [xml]"<add securityIdentifier=`"$microSid`" />";
            $smSvcHostConfig.SelectSingleNode("//allowAccounts").AppendChild($smSvcHostConfig.ImportNode($newNode.add, $true))
        }
    }
    else {
        Write-Verbose ("$logLead : $nullNodeName does not exist. New SIDs being added.")
        $configFileIsDirty = $true

        # This could be one line, but it's far more readable split out like this.
        $newNodes = $xmlBlock.SelectSingleNode("//$nullNodeName");
        $importedNodes = $smSvcHostConfig.ImportNode($newNodes, $true);
        $smSvcHostConfig.SelectSingleNode("//$knownParentNode").AppendChild($importedNodes)
    }

    if ($configFileIsDirty) {
        Write-Host ("$logLead : Saving the Modified The SMSvcHost.exe.config Configuration File" -f $nrConfigPath)

        $utfNoBOM = New-Object System.Text.UTF8Encoding($false)

        try {
            Save-XMLFile $configFilePath $smSvcHostConfig.OuterXml.Replace('xmlns="" ', [String]::Empty) $utfNoBOM
        }
        catch {
            $ErrorMessage = $_.Exception.Message
            Write-Warning ("$logLead : Saving file failed.")
            Write-Warning ("$logLead : $ErrorMessage")
            return
        }
    }
    else {
        Write-Host "$logLead : No Changes Required to The SMSvcHost.exe.config"
    }
}