March 21 Microsoft update patches

Well we already know that March was really black for Microsoft updates. I just want to mention few of them:

  • Exchange had remote code execution and a lot of organizations were hacked. Patch is already available. Look here for more info. Microsoft timeline is interesting on this exploit and is publicly available here or maybe take a look of the date of this post.
  • Windows DNS servers had also remote code execution vulnerability and also here are patches already available 
  • Windows 10 had blue screen when trying to print on some printers

The latest one was les critical for system administrators, but when you ask helpdesk, they had a lot of work and they uninstall the latest update KB5000802. Anyway, this is a security update and it should not to be best practice to uninstall the latest update (but there is no other way). At the same time, if you want not to have the same problem the day after, you had to defer windows update in time – what is not a recommended way. From today, there is a patch also for the latest mistake. It is available on this link. Please install it and turn your updating process back on.

Outlook 2019 – Problem with corrupted PST

Sometimes, when you tried to open PST from Outlook, it can occur that PST is corrupted. Outlook will get restarted and it will try to repair PST, but it is not always successful and some PST can remain corrupted. At this point Outlook will try to repair PST always on start, but if the first attempt failed, it will fail also the second, third, …
Outlook will try to repair this PST even in case you delete PST from disk. The reason is in registry key where Outlook record action to take and the last corrupted PST.
Now that you know this, it’s very simple to solve this problem: open regedit.exe, navigate to HKCU\Software\Microsoft\Office\16.0\Outlook\PST and change the value of the key PromptRepair to 0.
Start Outlook and it will open normally – without trying to repair the corrupted PST.
If you still need to repair PST, you have to find software like Stellar Repair Tool for Outlook or something similar on internet.

Did you close CMD window on Server core?

Yes, in some cases this can be a problem. As is true, that if you are connected in remote to a computer, you can just press CTRL + ALT + END and start a new window in Task Manager, this becomes more difficult if you are remote connected in remote session. In This case this shortcut will not work.
Well, the problem is pretty easy to solve:
Run PowerShell as Administrator on some other computer and find the session ID with command:
QUSER /Server:ServerName
You will see all active connections and here you will find also a SessionID for the connection that you want to kill.
Now you know your SessionID and finaly you can kill the connection. This can be done in two ways:
– As command in CMD: logoff Your_SessionID /server:ServerName
– In PowerShell: Invoke-RDUserLogoff -HostServer ServerName -UnifiedSessionId SessionID
Well, now you lose your session and if you will connect to that server, you will have a new session with your CMD window opened.

Windows Server 2019 Activation Error

Activation ErrorIf someone has a problem with activation of Windows server 2019 Standard Evaluation edition, maybe I can help someone with my post.
When I tried to activate the server, I received the error code 0xC004F069. Searching for this code on internet, I received many explanations like problems with KMS server, not accessible thru internet and so one. Of course, no one of this errors was the right error and I had to do my research.
The problem in this case is Evaluation edition and you have to solve this issue as first. To do this you have to change the scope of server using DISM command:
DISM /online /set-edition:serverstandard /productkey: N69G4-B89J2-4G8F4-WWYCC-J464C /accepteula – this key is GVLK Key!
This example is for Standard edition. Be aware that as product key you must use GVLK Keys!
If you need to know to which edition you can change, use the command
Dism /Online /Get-TargetEditions before you specify eddition in previous command
After this (you will see a progress bar with installation) you need to reboot the server. When the server will come back, you can activate it with your key:
Slmgr -ipk:YOUR-KEY
Slmgr -ato
Hope that I helped someone. Let me know.

RDWeb client error: »An unexpected server authentication certificate was received from remote PC«

If you are using HTML5 web site for remote apps and you have to change a certificate, you may expect some problems.
This technology is pretty new and there are not so many posts on internet, so troubleshooting could be difficult. In addition, you have more technologies and this means more problems.
I adopted HTML5 long time ago and everything worked fine for a long time. I have to say, that it was better that I expected. But now I have to change the certificate. Well, this is not a complicated job… or it is? The answer is yes, it is.
I have changed my certificate as usual, form server manager. I tried to connect to website and everything was OK. Then I tried to launch an application and I got this error:

RDP HTML5 Connection error
Wow, what to do now?! I remember that when I setup web client framework, I had to run PowerShell cmdlet to register the certificate. So, if I had changed the certificate, I have to register a new one – rerun PowerShell cmdlet —— .
This apparently didn’t solve my issue because from my computer it seems the situation haven’t change. But then a customer tried to work from a new computer and it worked! Why???
The reason was in cookies and cache files on the computer browser! Yes, you have to delete all cookies and cache files and (at least in my case) the webpage will work again.

RDP HTML5 Firefox setting RDP HTML5 Edge setting

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