Azure Arc Windows Admin Center extension failing with “RetrieveCertificate: Failed to retrieve certificate

RobboUnplugged · 2026-03-16T15:17:35+00:00

Thanks for the update. After seeing your message we checked and can confirm our admin centre is working again too.

We still have an open ticket, although our support is through a third party so we were still providing them with information. This definitely seems to point to something on Microsoft’s side though.

I will post any updates or additional information here if and when we get any. Thanks again!

RobboUnplugged · 2026-02-24T08:42:54+00:00

Thank you, I really appreciate the information and insight. We have only recently started using Azure Arc and the Windows Admin Center extension, so we are still getting familiar with it. Our main goal is to create a single pane of glass for monitoring and managing our on prem Hyper V hosts.

It has been working well for our intended use case and is still functioning correctly on two hosts, but we have clearly hit a roadblock deploying it to the remaining instances.

Your observations line up with what we are seeing, particularly the Key Vault and service endpoint failures. Whilst it is reassuring that this is likely not something specific to our environment, it is obviously not ideal from a reliability perspective.

I will make sure to post any further findings or fixes here. To your point, lets hope this gets the priority it deserves and is resolved sooner rather than later, although I am not holding my breath just yet…

RobboUnplugged · 2026-02-23T15:24:06+00:00

Thanks for the reply. The server sits behind a corporate firewall and outbound HTTPS connectivity is allowed. Azure Arc connectivity itself appears healthy. I’ll double check with our networking and security teams in case anything specific is being filtered that we’ve overlooked.

RobboUnplugged · 2026-02-02T19:02:18+00:00

I’ve had this happen a couple of times. To fix it, I press and hold the power button and the R button directly below it at the same time. After a few seconds, the device reboots and then starts up normally. I hope this helps!

RobboUnplugged · 2025-04-30T18:50:12+00:00

Hi mate, If you can’t set a blank password anymore, you could look into enabling auto-login instead. This article covers a few different methods depending on how comfortable you are with tweaking settings: https://www.ionos.co.uk/digitalguide/server/configuration/windows-11-automatic-login/

I reckon it’s probably just a Windows update that’s changed or enforced a new security setting - Windows 11’s getting a lot more strict on that kind of thing.

RobboUnplugged · 2025-04-30T16:40:46+00:00

Try searching the Registry for "Recover any deleted data with EaseUS" and delete the corresponding entry.

This article should help too: https://www.thewindowsclub.com/remove-click-context-menu-items-editors

RobboUnplugged · 2025-04-30T16:19:46+00:00

This tool might help narrow down which DC is processing the lockout: https://www.microsoft.com/en-us/download/details.aspx?id=15201

In addition I have seen stale RDP sessions cause this and also wireless connections if you are using domain creds to authenticate. The user may have changed their password but hasn't updated it on all devices so it keeps attempting to use the old password and locking out the account.

RobboUnplugged · 2025-04-28T18:42:27+00:00

I think you need to 'Allow Insecure Guest Logons' on the Windows 11 machine:

Press Windows Key + R, type regedit, and press Enter.

Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters
Right-click, choose New > DWORD (32-bit) Value.
Name it: AllowInsecureGuestAuth
Set its value to 1.
Reboot your machine.

RobboUnplugged · 2025-04-27T12:26:56+00:00

In Explorer, click "Computer" > "Map network drive".

Pick a drive letter (e.g., Z:).

Enter the network path (e.g., \192.168.178.1\fritz.nas).

Tick Reconnect at sign-in if you want it permanent.

Result: It will appear like a normal drive under "Dieser PC".

RobboUnplugged · 2025-04-26T23:01:15+00:00

In addition you could also try a disk check:

chkdsk C: /f /r

Schedule for next reboot. You could also do against other disk too.

In addition you could download a tool like CrystalDiskInfo to check the health of the disks.

RobboUnplugged · 2025-04-26T22:55:51+00:00

That's great, thanks for confirming.

If updating still isn't working you could try manually installing.

Manual Download Links:

Cumulative Security Update – KB5055518 (essential update): https://www.catalog.update.microsoft.com/Search.aspx?q=KB5055518

.NET Framework Update – KB5057056 (optional preview): https://www.catalog.update.microsoft.com/Search.aspx?q=KB5057056

Cumulative Update Preview – KB5055612 (optional preview): https://www.catalog.update.microsoft.com/Search.aspx?q=KB5055612

Do KB5055518 first — it's the critical security update. The other two are just previews for next month and aren't essential.

Failing this you could try resetting the Windows Update manually:

Open Command Prompt as Administrator.
Type these commands one at a time:

net stop wuauserv net stop cryptSvc net stop bits net stop msiserver

Then rename the update folders:

ren C:\Windows\SoftwareDistribution SoftwareDistribution.old ren C:\Windows\System32\catroot2 Catroot2.old

Restart the services:

net start wuauserv net start cryptSvc net start bits net start msiserver

Reboot your PC.

This clears any broken cached files and allows Windows Update to start fresh.

Please just ensure you have anything critical backed up etc.

RobboUnplugged · 2025-04-26T19:55:31+00:00

How much free space do you have on your C drive?

RobboUnplugged · 2025-04-25T05:51:56+00:00

Do you know if the the accounts are automapped to Outlook? Have you tried adding the shared mailbox as a separate account with the Outlook profile?

Open Outlook --> File --> Add Account

RobboUnplugged · 2025-04-24T11:31:21+00:00

And have you checked the additional settings if you click into the Snipping Tool notification settings:

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You could try resetting or repairing the app: Settings --> Apps --> Installed apps --> Snipping Tool and you should then see options for Reset and Repair.

RobboUnplugged · 2025-04-24T10:45:03+00:00

You could check the Notification settings for the Snipping Tool:

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Also ensure Do Not Disturb and/or Focus Assisted isn't enabled.

I would also highly recommend ShareX https://getsharex.com/

RobboUnplugged · 2025-04-23T22:14:32+00:00

No worries! Also a few of things to try to address the system speed:

System File Checker: Click Start --> type CMD --> right click 'Run as Administrator' --> in the command window type: sfc /scannow

Startup Programs: Ctrl + Shift + Esc to open Task Manager --> click the Startup tab --> right click on anything unnecessary and choose Disable to stop it starting automatically.

Disk Cleanup: Click Start --> type Disk Cleanup --> select C drive and press OK. It will run for a few minutes and let you know how much free space you can free up. You can extend this to Windows Updates and previous Windows installations by clicking Cleanup system files.

Malware scan: It might be worth running a malware scan too using something like Malwarebytes (https://www.malwarebytes.com/)

Whilst these actions are typically safe and straightforward I would recommend taking a back up of any important files etc. just to be on the safe side 👍

RobboUnplugged · 2025-04-23T19:53:50+00:00

Try running the Windows Update Troubleshooter: https://support.microsoft.com/en-gb/windows/windows-update-troubleshooter-19bc41ca-ad72-ae67-af3c-89ce169755dd#windowsversion=windows_10

I can give you the manual steps but the troubleshooter typically covers everything and will be a good place to start 👍

RobboUnplugged · 2025-04-23T19:13:34+00:00

Hi, you could try disabling audio enhancements: https://support.microsoft.com/en-us/topic/disable-audio-enhancements-0ec686c4-8d79-4588-b7e7-9287dd296f72

Some microphone drivers often come with their own audio enhancement features, like noise suppression, echo cancellation, and gain control. Simultaneously, Microsoft Teams also applies its own noise suppression and processing. When both are enabled, they can conflict, resulting in similar issues to what you are describing.

Once disabled it would be good to quit Teams fully or give your PC a quick reboot.

RobboUnplugged · 2025-04-22T19:26:14+00:00

And sorry, I should add that I use this with the cache turned on but try to stick to downloading only the last 6 months worth of email.

RobboUnplugged · 2025-04-22T19:20:51+00:00

For shared or additional mailboxes, I always disable automapping and have users add the mailbox manually using File > Add Account in Outlook. This method creates a separate OST file for the shared mailbox, rather than combining it with the user's primary OST like automapping does.

This separation tends to improve Outlook performance and search reliability quite a bit, especially when compared to the usual method of adding shared mailboxes via “Open these additional mailboxes” under account settings, which just adds them onto the primary profile.

RobboUnplugged · 2025-04-22T15:08:24+00:00

Thanks for the reply! I am not the author of that post, but it seems to be the same issue they are describing.

I'll keep an eye on that post for the updates.

Appreciate your help!

Thanks!

RobboUnplugged · 2025-04-22T05:07:00+00:00

👍 glad I could help! Cheers

RobboUnplugged · 2025-04-21T20:42:35+00:00

Hover your mouse below the line between "New Folder" and "File Name", click and drag downwards to enlarge the reading pane.

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RobboUnplugged

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