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    Since the Microsoft Security Patch on Tuesday, we've received many reports of users having connection problems like this:

    An authentication error has occurred.
The function requested is not supported

Remote computer: <computer name="">
This could be due to CredSSP encryption oracle remediation.
For more information, see https:/go.microsoft.com/fwlink/?linkid=866660

    The error impacts:

    • Remote Desktop Connection
    • Remote Desktop Connecting to Azure VMs
    • VPN Network Connections (before one can even try to use Remote Desktop)

    This is quite a mess and seems to be related to the security patch increasing security requirements, but not implementing the change to give the machine the increased security levels. The latter doesn't seem to occur if the machine has automated Windows Updates turned off.

    Unfortunately, Windows Update can't be automated in many environments such as development, build, test, staging and production without creating other problems.

    Wrote a blog post about our findings so far with a workaround on how to reduce Remote Desktop security settings to get around this problem. It doesn't require touching registry settings or other complicated steps:

    Remote Desktop Authentication Error Has Occurred. The function requested is not supported. CredSSP

    Would appreciate any insight on handling this across an enterprise without manually modifying the connecting and host machines.

    A common scenario is a person working from home not being able to connect to their own computer in the office or a VM.

    Thanks.

    Luke Chung
    Microsoft MVP
    President of FMS, Inc.
    Blog Facebook Twitter


    Friday, May 11, 2018 12:50 PM
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    Here is the FIX for this issue ..

    --> Change the Group Policy on your local client to use the vulnerable setting 

    Run:  gpedit.msc

    Go to à Computer Configuration -> Administrative Templates -> System -> Credentials Delegation -> Encryption Oracle Remediation

    Open - Encryption Oracle Remediation à  choose Enable  à change protection level àVulnerable à Apply

    Thanks and Regards,

    Regu

    • Proposed as answer by vor0nwe Wednesday, May 16, 2018 10:22 AM
    • Marked as answer by LukeChungMVP Thursday, May 24, 2018 6:29 PM
    Monday, May 14, 2018 1:40 PM
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    Thank you!!!
    Friday, May 11, 2018 8:25 PM
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    You're welcome. What was your situation?

    Luke Chung
    Microsoft MVP
    President of FMS, Inc.
    Blog Facebook Twitter

    • Proposed as answer by kk92009 Tuesday, May 15, 2018 2:37 AM
    Saturday, May 12, 2018 12:21 PM
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    Good information, but unfortunately my home PC is running the HOME version of Windows 10 and the RDP settings window does not offer the options shown in the workaround link.
    Sunday, May 13, 2018 2:23 PM
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    Thank you for sharing.

    Please remember to mark the replies as answers if they help.
    If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com.

    Monday, May 14, 2018 5:41 AM
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    Have this issue as well in our environment.  Typical untested patch that makes a headache for large groups of people.  Very irresponsible of the patch team.

    Remove the tick from the "Allow connections only from computers running Remote Desktop with Network Level Authentication" got us working again

    Windows Desktop Client to Server 2012 R2

    • Proposed as answer by thomfl Wednesday, May 30, 2018 4:23 PM
    Monday, May 14, 2018 7:13 AM
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    Or you can just uninstall update KB4103725 
    https://support.microsoft.com/bg-bg/help/4103725/windows-81-update-kb4103725

    worked for me

    Monday, May 14, 2018 9:43 AM
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    Thanks for sharing..

    it works with me after following this instruction https://blogs.technet.microsoft.com/mckittrick/unable-to-rdp-to-virtual-machine-credssp-encryption-oracle-remediation/

    we have big headache after KB4103725 patched get installed on clients win8. so should i update the kb4103725 on RDP host server 2012 r2 as well or wait for any further security kb? 

    Monday, May 14, 2018 12:06 PM
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    Here is the FIX for this issue ..

    --> Change the Group Policy on your local client to use the vulnerable setting 

    Run:  gpedit.msc

    Go to à Computer Configuration -> Administrative Templates -> System -> Credentials Delegation -> Encryption Oracle Remediation

    Open - Encryption Oracle Remediation à  choose Enable  à change protection level àVulnerable à Apply

    Thanks and Regards,

    Regu

    • Proposed as answer by vor0nwe Wednesday, May 16, 2018 10:22 AM
    • Marked as answer by LukeChungMVP Thursday, May 24, 2018 6:29 PM
    Monday, May 14, 2018 1:40 PM
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    Here is the FIX for this issue ..

    --> Change the Group Policy on your local client to use the vulnerable setting 

    Run:  gpedit.msc

    Go to à Computer Configuration -> Administrative Templates -> System -> Credentials Delegation -> Encryption Oracle Remediation

    Open - Encryption Oracle Remediation à  choose Enable  à change protection level àVulnerable àApply

    Thanks and Regards,

    Regu



    • Proposed as answer by RedITAdmin Friday, May 18, 2018 2:47 PM
    Monday, May 14, 2018 1:41 PM
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    Here is the FIX for this issue ..

    --> Change the Group Policy on your local client to use the vulnerable setting 

    Run:  gpedit.msc

    Go to à Computer Configuration -> Administrative Templates -> System -> Credentials Delegation -> Encryption Oracle Remediation

    Open - Encryption Oracle Remediation à  choose Enable  à change protection level àVulnerable à Apply

    Thanks and Regards,

    Regu

    This fixed it for me, thank you!

    Windows 10 Pro --> Logging into a Windows server 2012 R2 on a domain

    Monday, May 14, 2018 2:21 PM
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    Is this the same as the user changing their Remote Desktop setting from the dialog box that we suggested?

    Going into gpedit.msc is much more intimidating, and I don't think end users are allowed to do that.

    Luke Chung
    Microsoft MVP
    President of FMS, Inc.
    Blog Facebook Twitter

    Monday, May 14, 2018 2:34 PM
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    You need to make sure both your workstations and servers are patched with the March CredSSP patch.  On May Patch Tuesday, Microsoft released a patch that basically enforces the March patch, so if your workstation got the May patch but you're trying to connect to servers that haven't received the March patch, you'll get this error.

    As a workaround, you can push a Group Policy out or edit a registry key locally, but neither one of those is considered a long-term permanent solution.

    You can read - How to Fix Authentication Error Function Not Supported CredSSP Error RDP for more information on the Group Policy and registry key.

    For the Group Policy, you'll need the ADMX files from a patched server.  In the article above, there's a link to those files from a patched Windows 2012 R2 server which should work.

    Policy path: Computer Configuration -> Administrative Templates -> System -> Credentials Delegation Setting name: Encryption Oracle Remediation 

    [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\CredSSP\Parameters]
    "AllowEncryptionOracle"=dword:00000002

    • Proposed as answer by Waterman981 Monday, May 14, 2018 9:12 PM
    Monday, May 14, 2018 4:37 PM
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    Are those instructions for end users or administrators?

    Most users can't change registry settings on their own, much less the HKLM hive.

    They can change the check box on the Remote Desktop dialog.

    If it's a setting on the network that's changed, will that support people's home PCs and devices they use to remote into their office PC?

    Luke Chung
    Microsoft MVP
    President of FMS, Inc.
    Blog Facebook Twitter



    Monday, May 14, 2018 4:39 PM
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    Hi and thanks for your observations.

    Don't you think its ironic that the security patch enforced on us poor sods forces one to operate in a less secure manner and the eta of the patch for the patch is unknown. Thanks again Microsoft, you bunch of gimps.

    KillerWombat

    Monday, May 14, 2018 10:36 PM
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    its worked for me Thanks 
    Tuesday, May 15, 2018 9:29 AM
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    This worked for me. Thanks!
    Tuesday, May 15, 2018 10:30 AM
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    Thanks! Worked for me.
    Tuesday, May 15, 2018 4:21 PM
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    Thanks . Worked for me. I am using Azure. Worked on both WIndows 10 and WIndows 7 devices.
    Tuesday, May 15, 2018 7:01 PM
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    Hi Luke,

    Regu Sankar's solution using gpedit.msc is not the same as your solution for the following reason:

    I was able to use gpedit.msc on my local client (which fixed the issue), whereas I was NOT able to open the system properties on the server, because that's a VM running in Azure.

    To change the server's system properties, I would need to connect to that machine via Remote Desktop. See the problem?


    • Edited by vor0nwe Wednesday, May 16, 2018 10:35 AM
    Wednesday, May 16, 2018 10:34 AM
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    Thank you for this article, Luke.

    In my user's case, the issue was resolved by updating Windows 10 to the most current version (16299.431 as of today, May 16th, 2018). The machine was missing 2018-05 Cumulative Security Update 1709 - KB4103727. My own Windows 10 box was able to connect to the RDP computer without issue, which helped to lead me in the direction of checking revisions. Being more current, my machine had no problem connecting to the RDP machine. I did not want to reduce the security by unchecking the box for Network Level Authentication, so I was glad that Windows updates fixed this.

    Best regards,

    Philip Schember
    Senior IT Technician
    University of Tennessee

    Wednesday, May 16, 2018 2:44 PM
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    excellent...working properly
    Thursday, May 17, 2018 8:34 AM
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    I see all of the solutions only if you able to access windows server. RDP access was the only way I could manage the server. What should I do now, I am getting this message and cannot access the server any advice ?
    Thursday, May 17, 2018 3:29 PM
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    This worked for me.  

    I installed the Windows 10 "Upgrade" to the latest version, which shows to be Version 1709, build 16299.431.  After that update completed, I received this authentication error.  Using the Fix first posted by Regu Sankar, it worked immediately.  

    So thank you, Regu!

    Thursday, May 17, 2018 4:17 PM
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    Hi All,

    I just provisioned a Windows Server 2012 R2 server in Azure. Everything has installed properly. I can see the boot screen. I cannot RDP to the newly provisioned server from a Windows 7 Enterprise RDP Client. 

    It is not showing the CredSSP part of the message.

    Thanks,

    Ken

    Thursday, May 17, 2018 6:52 PM
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    My ability to remote in stopped this week when the update caused the error you mentioned in the original post. My Remote settings were actually already set the way that you suggested - I checked that first per your suggestion.

    I wanted you to know that the fix that worked for me was going into gpedit.msc as suggested by Regu. I was one of those employees/end users who needed to remote in from home, and as you mentioned, I wasn't sure I'd have the permissions to go in there, but it turns out that I did.  

    Thank you for starting this discussion because in it I found a solution to my issue. I hope my feedback helps you or someone else.

    Friday, May 18, 2018 2:53 AM
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    It works for me.

    Windows 7 connecting to Windows Server 2016 error.

    Solution:

    In the server you are connecting(in my case winserver 2016) uncheck the "Allow Connections only from computers running Remote Desktop with Network level Authentication(recommended)".

    <img alt="System Properies -> Remote tab -> Uncheck" src="http://blog.fmsinc.com/wp-content/uploads/2018/05/remote-windows10.png" />

    Friday, May 18, 2018 6:34 AM
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    OK!
    I think I have fixed the issue for me, so let me tell you what I did as it may help others.

    Seeing that 'windows update KB4103725' was a bad release and it was released on the 5/8/18. None of the advice I found worked.

    1) Change:

    [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\CredSSP\Parameters]
    "AllowEncryptionOracle"=dword:00000002
    (isn't there in windows 7)

    2) Remove:

    Remove the tick from the "Allow connections only from computers running Remote Desktop with Network Level Authentication"
    (isn't there in windows 7)

    3) Delete:

    Delete windows update 'KB4103725'
    (isn't there in windows 7)

    4) Click the tick:

    Click the tick from the "Allow connections from computers running any version of Remote Desktop"
    (as shown at:
    http://blog.fmsinc.com/remote-desktop-authentication-error-function-requested-is-not-supported-credssp/
    ,but isn't there on my windows 7)


    Finally I saw a windows update 'KB4103718' which was installed on my computer on 5/9/18. As it looked similar to 'KB4103725', I deleted it and restarted my computer. I could then connect!
    Friday, May 18, 2018 6:47 AM
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    Thanks!
    Friday, May 18, 2018 7:09 AM
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     This Fix worked for me. Thank you.

      

    Friday, May 18, 2018 10:01 AM
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    This worked for me! Thanks so much! .....now back to work!
    Friday, May 18, 2018 2:48 PM
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    Thanks Regu, this fixed it for me.
    Friday, May 18, 2018 5:33 PM
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    Do you know if it applies to Windows Server 2016 and / or Windows Server 2012R2?

    For your  help and time, thanks.

    Friday, May 18, 2018 6:57 PM
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    Similar circumstances in my workplace following the Tuesday updates.  Post any attempts at resolution to this.  
    Friday, May 18, 2018 8:08 PM
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    Here is the FIX for this issue ..

    --> Change the Group Policy on your local client to use the vulnerable setting 

    Run:  gpedit.msc

    Go to à Computer Configuration -> Administrative Templates -> System -> Credentials Delegation -> Encryption Oracle Remediation

    Open - Encryption Oracle Remediation à  choose Enable  à change protection level àVulnerable à Apply

    Thanks and Regards,

    Regu

    This one fixed my problem. Thanks.
    Friday, May 18, 2018 10:56 PM
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    Thanks, fixed my problem
    Sunday, May 20, 2018 9:36 AM
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    This worked for me (Windows 10 Pro).

    Thanks a lot "Ragu Sankar".


    Sunday, May 20, 2018 8:00 PM
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    Thank you, this fix for me.

    Alin Lam

    Monday, May 21, 2018 6:01 AM
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    I've updated my blog post with the information shared here about editing Group Policy and setting it to Vulnerable. It's an option if you can't modify the target PC/VM, and have administrator rights to your PC.

    The update includes screenshots and step-by-step instructions for doing so: 

    Remote Desktop Authentication Error Has Occurred. The function requested is not supported. CredSSP Workaround

    Sorry to see there are still so many people suffering from this problem in the second week. Hope it helps. 

    Luke Chung
    Microsoft MVP
    President of FMS, Inc.
    Blog Facebook Twitter



    Monday, May 21, 2018 4:17 PM
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    Thanks

    This worked for me..

    "

    Here is the FIX for this issue ..

    --> Change the Group Policy on your local client to use the vulnerable setting 

    Run:  gpedit.msc

    Go to à Computer Configuration -> Administrative Templates -> System -> Credentials Delegation -> Encryption Oracle Remediation

    Open - Encryption Oracle Remediation à  choose Enable  à change protection levelàVulnerable à Apply

    Thanks and Regards,

    Regu"

    • Edited by VaGangal Monday, May 21, 2018 6:45 PM
    Monday, May 21, 2018 6:44 PM
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    Thank you!
    Monday, May 21, 2018 8:57 PM
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    Not a fix if you're running Windows 10 Home.
    Tuesday, May 22, 2018 4:39 PM
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    I think the this is the best solution since you don't need to reboot your desktop. Thank you Regu!
    Tuesday, May 22, 2018 10:13 PM
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    This Fixed the issue for me too... 
    Super thanks!!!
    Thursday, May 24, 2018 11:35 AM
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    Worked great thanks.
    Thursday, May 24, 2018 5:29 PM
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    I was locked out of one VM Host machine and one VM on another host, Regu's fix worked for me. Thank you!

    I did remove the KB4103718, but it had no effect.

    Thursday, May 24, 2018 6:28 PM
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    https://portal.msrc.microsoft.com/en-us/security-guidance/advisory/CVE-2018-0886

    Depend on which operating system you have.

    Friday, May 25, 2018 12:08 PM
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    Hiu Guys.

    Thanks you for share this info.

    It worked for me.

    Client Win7/10 to connect Win Srv 2012/2012R2.

    Have a Niece Day.

    "Here is the FIX for this issue ..

    --> Change the Group Policy on your local client to use the vulnerable setting 

    Run:  gpedit.msc

    Go to à Computer Configuration -> Administrative Templates -> System -> Credentials Delegation -> Encryption Oracle Remediation

    Open - Encryption Oracle Remediation à  choose Enable  à change protection levelàVulnerable à Apply "

    • Edited by carlyML587 Friday, May 25, 2018 9:21 PM
    Friday, May 25, 2018 9:19 PM
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    thanks 

    Saturday, May 26, 2018 10:04 AM
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    Guys, when specifying fixes, please clearly state if the specific fixes/workarounds pertain to the client or the server.   My understanding is that unchecking NLA pertains to the server, not the client.

    I'm assuming that the 5/16 update pertains to the client, since it was mentioned to be a Win10 patch, not the server, correct?

    A consultant can't RDP into our servers which may be behind in patches, but have NLA disabled throgh local GPO.
    I am unable to reproduce the problem but my personal Win10 desktop is fully patched and on build 1803.
    My laptop was on build 1709 and not yet having patches from 5/8 but after fully patching it, it will be on build 1803.   Our corporate Win10 workstations are managed by SCCM.  I suspect they are still on build 1709 and have received the 8/5 patch, so my tests are probably not exact to reproduce the problem.

    But with all these discussions/comments, many are lacking Win10 builds involved and if the recommended changes are to be applied to client or server.

    Sunday, May 27, 2018 5:38 PM
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    Thank you!
    Monday, May 28, 2018 3:45 AM
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    Thanks a lot Philip Schember.

    It works for me (and for my team).

    Monday, May 28, 2018 9:53 AM
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    Have this issue as well in our environment.  Typical untested patch that makes a headache for large groups of people.  Very irresponsible of the patch team.

    Remove the tick from the "Allow connections only from computers running Remote Desktop with Network Level Authentication" got us working again

    Windows Desktop Client to Server 2012 R2

    Yep sadly this level of garbage QA is typical of Microsoft in Win10. For Enterprise, Microsoft's current testing regime is a disaster. Visual Studio, Windows, Teams, Office all buggy, full of regressions. New Remote Desktop app is absolutely abysmal over another RDP. It's atrociously laggy - unusable. Plain vanilla upgrades of apps is a minefield. Stuff just doesn't work.
    • Edited by MRR111 Tuesday, May 29, 2018 3:07 AM
    Tuesday, May 29, 2018 3:03 AM
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    Thanks Regu, that solved the problem for me.
    Tuesday, May 29, 2018 4:08 PM
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    use this link:

    https://gallery.technet.microsoft.com/Remote-desktop-authenticati-a9f4b9f8

    • Proposed as answer by NICOLA FER Thursday, June 07, 2018 1:05 AM
    Wednesday, May 30, 2018 3:21 AM
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    Thank you. This solution worked for me. Hopefully, Microsoft will fix this patch soon. 
    • Proposed as answer by ALICE FONTINE Saturday, June 09, 2018 4:45 AM
    Wednesday, May 30, 2018 9:35 PM
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    Thanks... :)
    Thursday, May 31, 2018 8:45 PM
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    Thanks, That helped me.... Nice one
    Friday, June 01, 2018 2:37 PM
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    This worked for me.

    Thank you

    Saturday, June 02, 2018 6:24 AM
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    Protection level Vulnerable didn't work, changing it to Mitigated worked for me
    • Edited by Sujan00 Saturday, June 02, 2018 2:53 PM
    Saturday, June 02, 2018 2:53 PM
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    Or you can just uninstall update KB4103725 
    https://support.microsoft.com/bg-bg/help/4103725/windows-81-update-kb4103725

    worked for me


    This is the best and safest fix suggested so far, not compromising security like the other suggestions.

    And it works.

    Thank you.

    Tuesday, June 05, 2018 8:52 AM
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    Hi and thanks for your observations.

    Don't you think its ironic that the security patch enforced on us poor sods forces one to operate in a less secure manner and the eta of the patch for the patch is unknown. Thanks again Microsoft, you bunch of gimps.

    KillerWombat

    Patch for the fix is KB4103725 as suggested above by Kristina Chitalovska
    Tuesday, June 05, 2018 8:55 AM
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    Awesome!!! Worked for me!!! Don't know what caused the error thought, but I'm able to Remote in without any issues.

    Cesar Vazquez

    Tuesday, June 05, 2018 8:19 PM
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    Thanks, this worked for me! 
    Wednesday, June 06, 2018 2:40 PM
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    use this link:

    https://gallery.technet.microsoft.com/Remote-desktop-authenticati-a9f4b9f8

    Thank you. This solution worked for me
    Saturday, June 09, 2018 8:07 AM
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    Here is the FIX for this issue ..

    --> Change the Group Policy on your local client to use the vulnerable setting 

    Run:  gpedit.msc

    Go to à Computer Configuration -> Administrative Templates -> System -> Credentials Delegation -> Encryption Oracle Remediation

    Open - Encryption Oracle Remediation à  choose Enable  à change protection level àVulnerable à Apply

    Thanks and Regards,

    Regu

    Thank you very much for the solution!
    Monday, June 11, 2018 4:59 AM
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    Thank you for the solution
    Monday, June 11, 2018 7:42 AM
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    Huge thanks for this - saved me lots of time and aggravation!

    Sarah.

    Wednesday, June 13, 2018 8:53 AM
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    You dont necessarily have to RDP to remote machine when you can manage it using other methods (Powershell/Remote registry) to name a few.

    reg add "HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System\CredSSP\Parameters" /f /v AllowEncryptionOracle /t REG_DWORD /d 2


    Wednesday, June 13, 2018 11:50 PM
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    Thanks
    Wednesday, June 13, 2018 11:52 PM
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    Tnx ! its work !! 
    Thursday, June 14, 2018 7:13 AM
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    It worked for me.

    Thank You !

    Raghvendra

    Friday, June 15, 2018 6:51 AM
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