Powershell

Refresh scenario and LAPS

When doing reinstall of machines a common issue is that the LAPS password does not get updated due to the fact that the machine thinks the password is current. So to prevent the nice folks from Microsoft wrote a small script to reset the timer and force and update. The original blog post and script can be found here https://blogs.msdn.microsoft.com/laps/2015/05/06/laps-and-machine-reinstalls/

Now my issue with this is there is no log file created and no way for helpdesk to verify it actually happend (besides logging on which I don’t like).

So to solve this I have made an updated version of the script that centralizes logging basone if the script is run as part of MDT, Configuration Manager or Standalone.

image

Script can found on github here https://github.com/LofgrenP/Scripts/tree/master/Clear-xTSPasswordTimeStamp

Advertisements

Updating the MBAM Agent

When upgrading MBAM there are a couple things to note. Number one, if you haven’t already you should make sure you have PowerShell scripts to setup everything on the server side. This will be a nice to have since every servicerelease requires a uninstall/reinstall. And with lots of serviceaccounts, groups and what not, not automating the install will cause you headaches everytime.

The next issue is that the agents needs to be ugpraded everywhere. Now there is no panic to upgrade the agents on the machines as the old version will keep reporting to a newer server release. However to benefit from all the bugs and security fixes the update should absolutley be deployed.

Now the issue, when you run the MSP on an already patches systems (let’s assume you already have a service release installed) nothing happends. Well this is due to the fact that the MSP only upgrades from version 1.0.0.0 as can be viewed in the MSP itself. Below is from the x64 patch of the september release.

image

Now to fix this the easiest way is actually to create a wrapper around the MBAM agent installer and use that to install the agent. That way if there is already and agent installed we can uninstall it and reinstall the patched version. And if there is no version installed we can go ahead and install the version.

All of this can be done using PowerShell and checking the registry for known keys.

image

To save you the time on creating your own script to solve this you can use mine. It can be found on github overe here https://github.com/LofgrenP/Scripts/tree/master/Install-MBAMClient

Now the script requires a simple folder structure looking like this

image

Now in the source folder you place the MbamClientSetup.exe and the patch file from the latest servicingrelease. The script is prepped for the current September 2017 release.

Next up is you run the script as a administrator on a box, or run the script as part of a package in Configuration Manager, an application in MDT or basically however you want.

The logfiles will switch location based on if its run as part of Configuration Manager, MDT or standalone. The end result will always be the same!

Happy upgrading!

/Peter

Redistributing failed content

When working with ConfigMgr you always end up distributing content to several DPs. This normaly goes off without a hitch but from time to time this fails. If you then have several DPs spread across a large geographical area, WAN links may be questionable. So when a package then fails most are not happy to redistribute the content to all DPs again.

image

So to help sort that out the following script can be used. The script will find all failed packages on a specified DP and then redistributed them to that single DP only. All that is needed is to run in on the Primary site server / server with SMS provider and specifiy your SiteCode and DP FQDN.

The script is available on Github over here: Update-ContentForSingleDP

Happy deploying!

/Peter

PowerShell remoting – source vs destination

Powershell remoting, the ability to remotley manage and influence devices is a key part of PowerShell. By default PowerShell remoting is enabled on servers and one of the lazy “security” features you can use is to only allow connections from specified networks.

In a domain network this is very easy to do, all you need is a small group policy that sets the networks. There is one thing you need to note, that is not really documented.

The Group Policy

The group policy is a regular computer policy setting found under “Computer\Policies\Administrative Templates\Windows Components\Windows Remote Management (WinRM)\WinRM Service” and the actual poliy item is named “Allow remote server management through WinRM”

When you enable this policy you can enter networks the server will consider trusted.  So lets say you have your server on the network 192.168.1.0, that would mean you set the filder to 192.168.1.1-.192.168.1.254.

The issue

What you need to consider is the following. Say you have servers on two seperate networks and one is considered management network, lets say it uses 172.16.1.0/24. This means you now specify the management network as approved. But the servers you are accessing is on your primary server network 192.168.1.0/24. You have to specifiy both source and destination networks for this to work as this also controls the actual listners and if you only specify the 172.16.1.0/24 network the listners on the servers on network 192.168.1.0/24 will not be enabled.

The solution

For the scenario above make sure to specify both networks in your GPO. So the filter will be set to 192.168.1.1-192.168.1.254,172.16.1.1-172.16.1.254

winrm

/Peter

Techdays 2017 Pre-Conf Slides

Me and Jörgen Nilsson (@ccmexec) did a pre-conf together at Techdays in sweden. And after much slacking here are now the slide deck from that pre-conf.

Here is the link to download the slidedeck!
https://1drv.ms/b/s!ArAh2CEqOjRkk-8ZDAVJ1vRqi8Glxg

Techday2017

/Peter

Windows 10 1709 Reference Image

Update – 2018-03-06 – Read at the bottom

When creating a Windows 10 reference image a common issue is that the store updates will autoupdate while you are busy installing software updates and applications. This then causes sysprep to fail in giant ball of fire.

To solve this there are basically two options and for some option one doesn’t seem to work which is why I always opt for option two.

Option 1, follow the guidance for disabling auto store updates. This consists of adding a DWORD registry item to HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\WindowsStore named AutoDownload with a value of 2. More info on how to do this check out the blog over at deploymentresearch.com

Option 2, is to use a WSUS and then disable internet access for the duration of the build. This can easily be achieved using PowerShell and a sprinkle of magic.

Here is how! Lets start with creating a small PowerShell Script.

param (
[Parameter(Mandatory=$False,Position=0)]
[Switch]$Disable
)

If (!$Disable) {
Write-Output “Adding internet block”
New-NetFirewallRule -DisplayName “Block Outgoing 80, 443” -Enabled True -Direction Outbound -Profile Any -Action Block -Protocol TCP -RemotePort 80,443
}

if ($Disable) {
Write-Output “Removing internet block”
Get-NetFirewallRule -DisplayName “Block Outgoing 80, 443” | Remove-NetFirewallRule

}

Save that into as Invoke-InternetAccess.ps1 and place the file into the MDT deployment share script folder.

Now time to set the sequence.
Add two “Run PowerShell script” steps as shown below.

Ref1709

For the first one just set the script name to Invoke-InternetAccess.ps1
For the second one set the script name to Invoke-InternetAccess.ps1 and parameters to –Disable

All done! Now you can run your sequence and not worry about any store updates during your build.

Update – 2018-03-06
There has been some discussion around this and there is an alternative to the way below which will work if you use MDT. The solution is a simple as it is elegant and requires very little configuration.

All you would need is to set HideShell=YES in your customsettings.ini. This will not load a full explorer and hence store will not start and there will be no store updates downloaded.

 

Happy deploying

/Peter

ADFS Single Sign on with Edge

I usually don’t blog about ADFS but since I recently had to solve this issue for a customer I thought someone else might find it usefull as well.

When you use Edge or Chrome as your primary browser and using a machine that should have SSO with Office 365 and Sharepoint you still get a login page. This happens because by default ADFS have a set of trusted browser strings and others will be prestend with a form authentication.

To fix this on your ADFS server you need to use a couple of simple powershell commands.

Let’s start with just getting what browser strings are trusted currently.

Get-ADFSProperties | Select -ExpandProperty WIASupportedUserAgents

DefaultSettings

As you can see there browser agent for Edge and Chrome are missing. To fix this we run the following powershell command.

Set-AdfsProperties –WIASupportedUserAgents @("MSAuthHost/1.0/In-Domain","MSIE 6.0","MSIE 7.0","MSIE 8.0","MSIE 9.0","MSIE 10.0","Trident/7.0", "MSIPC","Windows Rights Management Client","Mozilla/5.0","Edge/12")

Then restart the ADFS service

Restart-Service ADFSSrv

That is, you can verify the settings by getting the ADFS properties again

FixedSettings

All done and Single Sign On will should now work using Edge or Chrome as well!

 

/Peter