Thumbnail Previews not showing in Windows 10 File Explorer

Use Disk Cleanup to remove your thumbnails

Your thumbnails use thumbnail cache, but if the thumbnail cache is corrupted you might experience this problem. To fix the issue, you need to remove the thumbnail cache and Windows will recreate it. This is a simple process and you can do it by following these steps:

  1. Press Windows Key + S and enter disk cleanup. Select Disk Cleanup from the menu. Alternatively, you can just open the Start Menu and type disk cleanup to search for it.
  2. Once Disk Cleanup starts you’ll be asked to select the drive you wish to scan. Select your System drive, by default it should be C, and click on OK.
  3. Wait while Disk Cleanup scans your drive.
  4. When Disk Cleanup window appears, check Thumbnails from the list and click on OK. Few users are suggesting to select Temporary files as well, so you might want to do that.

Windows will now remove the thumbnail cache from your PC. Once the thumbnail cache is removed, Windows will generate it again and your problem should be resolved completely.

There are 21 different ways to fix this, No. 7 is working for me, so I copied it here. This is the source URL: https://windowsreport.com/thumbnail-previews-not-showing/

Also other reference:

https://www.wikihow.com/Enable-Image-Preview-to-Display-Pictures-in-a-Folder-(Windows-10)#step_2_1

https://www.thewindowsclub.com/thumbnail-previews-not-showing-windows

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Windows Server 2012 R2: How to add the DHCP role using PowerShell?

Found this blog quite helpful in the middle of a deployment, when getting “Failed to open the runspace pool. The Server Manager WinRM plug-in might be corrupted or missing” in GUI. So PowerShell is more capable if you are confident what you are doing. Here is what I put in the ISE to execute one by one.
Install-WindowsFeature DHCP -IncludeManagementTools
Get-WindowsFeature
Install-WindowsFeature WINS -IncludeManagementTools
Get-WindowsFeature

Dautti

The following is a sample chapter from the e-Book Windows Server 2012 R2: How to install and add roles? (Server Core). Enjoy reading!

This is what people need: an easy-to-deploy, easy-to-use tool.” Nat Friedman

What is Dynamic Host Configuration Protocol (DHCP)?

Basically, Dynamic Host Configuration Protocol (DHCP) is a computer network protocol that assigns IP addresses to computers on a network. The working principle of DHCP briefly is described through the acronym DORA which means Discovery, Offer, Request, and Acknowledgement. In a computer network, when you turn on your computer and the operating system boots up the DHCP Client service transmits the request for an IP address. In fact, this request is an attempt to identify whether or not a DHCP server is available on a LAN. If it is, the DHCP server accepts the DHCPDISCOVER message from the client, reserves an IP address for the client, and…

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Promoting DC to Global Catalog Server

Prashant's Scribble!

When we are working with Active Directory sometimes we are told to promote  Domain Controller to Global Catalog (GC) server.

We all know how to promote DC to GC. Detailed procedure is given here.

If the Active directory database size is large then it will take many hours to replicate all the partitions to the newly designated Global Catalog server. For a database of around 13 GB it will take around 8-9 hrs to mark the server as Global Catalog Server. But big question is how do you know that replication is in progress and everything is running fine as per your plan? Short answer – Keep checking the size of NTDS.DIT file every 15 minutes or so which should keep increasing and finally completing the replication process.

Also you can keep checking Directory Service event log in event viewer. It will display couple of events with event ids…

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“The RPC server is unavailable”

In the scenario of getting event logs remotely, using Event Viewer or PowerShell, some time in an unfamiliar environment, the system admin may get this error “The RPC server is unavailable” even the correct credential is supplied.

Why? The service is running on the remote host – most of the time it’s a Windows Server. There must be something block the traffic – Windows Server itself or the network.

Look into the Windows server – the target host, there are several places to check – The Windows Firewall, the Group Policy. Many online resources focused on WMI Group rules, such as running the following command to enable this group of firewall rules – 3 Inbound and 1 Outbound.

> netsh advfirewall firewall set rule group=”Windows Management Instrumentation (WMI)” new enable=yes

The same approach is to open 3 Inbound rules using Windows Firewall with Advanced Security or GP Editor:

Computer Configuration
– Windows Settings
— Security Settings
— Windows Firewall Advanced Security
—- Inbound Rules
—- Right-click and select ‘New Rule’ (Key point)
—- Predefined radio button
—- Choose Remote Event Log Management (Drop down list)
—- Click Next
—- Accept the defaults and click ‘Next’
—- Choose Allow the connection and click ‘Finish’

But, sometimes these local firewall rules are already enabled, by default, unless they are disabled on purpose. Then what?  There is another place to look at, despite the message “The RPC server is unavailable”, some newer operation systems give more information in a pop-up.

image

Now look at these two rules, they could be disabled, just enable them you will be able to access Event Logs remotely.

This is tested in both Event Viewer and PowerShell, on Windows Server 2012 R2.

p.s. I don’t think .Net Framework 3.5 is necessary in this case, some online article mentioned that though. But still worth to check if the following services are running on the target host:

  • Windows Management Instrumentation service
  • TCP/IP NetBIOS Helper service
  • Remote Procedure Call (RPC) service

Remote Desktop Services (RDS) in Azure

It is a Dev/Test environtment available to all Azure subscribers. I tried this out and it is not too bad. In my opinion, this is the way to go for Microsoft, because it provides a package to potential customers that are not quite familiar with how Azure environment is to be built, either for the PoC purpose or next, in production. Once people get more idea on how it works, there will be less barrier to adopt more in the cloud.

Traditionally, when we start build an infrastructure and services in data center, we started with IP allocation, physical location/rack/power supply, network patching, switches/load balancers, servers, storage, then firewall, iLO/DRAC, O/S build, license, etc.  But when we start in Azure, where I should start is a big question to many of us.  If one just wants to do some testing but need more than a couple of servers and in a small to medium scale, there is no sense to go through all the hassles.

This RDS testing package I set up over the long weekend is pretty simple to start with. Under the basic concept of MS Remote Desktop Services, you can go through the documentation and team blog first, then start picking the size and scale of the environment – redundency, vm size, etc.  At least you will need one DC on Windows Server 2012 R2, and three servers on Windows Server 2016 – RDSH, RD Broker, RD Gateway (including RD Web Access) – other service can be combined such as RD license server and file storage. So far I don’t see there is firewall between them like the diagram showed, all testing servers are in the same subnet (10.0.0.x), of course Azure would guard everything that are accessible from the Internet.

Most steps are straight forward as I did before for  the similar services. Only a few places in the document maybe still referring to a different version of Windows Server (2012 R2 vs 2016 or vice versa).

Remote Desktop Services @ MS Docs

Windows Server RDS team blog site

First look at updates coming to RDS (Sept 2017)

Here are links to Windows Server 2012 based RDS:

https://workspot.zendesk.com/hc/en-us/articles/202698935-Remote-Desktop-Services-RDS-Configuration-Guide-for-Remote-Desktop-and-RemoteApp

https://blogs.technet.microsoft.com/yungchou/2013/02/07/remote-desktop-services-rds-quick-start-deployment-for-remoteapp-windows-server-2012-style/

Other team blogs, some are not current but future ideas:

https://remotedesktop.uservoice.com/forums/301635-remote-desktop-for-windows-universal

http://microsoftplatform.blogspot.ca/

Unrelated links:

https://azure.microsoft.com/en-us/roadmap/

https://azure.microsoft.com/en-us/resources/templates/

https://learningportal.microsoft.com/learning-path/?search=&jobroles=2&products=4

Quick Hits: Writing to a Read-Only Property

Try to link this to List CanReceiveEmail Enable/Disable.

Learn Powershell | Achieve More

This post is less on doing something useful and more on just proving that I can do something even though PowerShell is trying to tell me that I cannot do it. That little thing is updating a property on an object that is set as Read-Only.

My example to show you how you can do something like this is by looking at $PSVersionTable which as we all know gives us some great information about what version of PowerShell that we are using.

image

I am also using this as this was an example used in our previous user group meeting in which we were shown that the properties here could not be updated.

From this object, I am going to look more at the PSVersion property which of course is an object within this object.

image

Looking at the properties of this object, we can see that each of the properties are…

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RDP error Local Security Authority cannot be contacted

Comment from similar post: With previous versions of the RDP protocol, a user was allowed to change their password graphically after signing on. However, NLA has no such provision, at least the way it’s implemented in RDC. So, if you have to change your password you are SOL unless you can get to a console.

The Regime

The error:

Remote Desktop Connection: An authentication error has occurred.
The Local Security Authority cannot be contacted
Remote Computer: hostname or ip

The issue:

Seems to happen more on 2012 server but if you have Network Level Authentication enabled it will not prompt you for a GUI change password option if you have change password at next logon selected. This error could happen for other reasons as well

One of the possible fixes:

  1. uncheck change password at next logon if its selected
  2. use a different tool to change your password at first logon

Additional info can be found at https://blog.mnewton.com/articles/Solution-RDP-The-Local-Security-Authority-cannot-be-contacted/

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