KB ID 0001433
Problem
When attempting to RDP to a remote machine;
An authentication error has occurred.
The function requested is not supportedRemote computer: {name}
This could be due to CredSSP encryption oracle remediation.
Or you may just see;
An authentication error has occurred.
The function requested is not supportedRemote computer: {name}
Solution
This is happening after you have a applied a windows security update it was this security update. It also tells you how to change your GPOs accordingly.
If your business is in Chaos – set it to ‘Vulnerable‘ to get things working, get EVERYTHING patched, then change it to ‘Mitigated‘ or ‘Force Updated‘. (WARNING: any change requires a reboot!).
‘Encryption Oracle Remediation’ Policy Is Missing?
Copy these two files from a freshly updated machine;
- C:\Windows\PolicyDefinitions\CredSsp.admx (Dtd Did Feb 2018)
- C:\Windows\PolicyDefinitions\en-US\CredSsp.adml (Dtd Feb 2018 – Your local folder may be different i.e. en-GB)
On a DC, navigate to;
- C:\Windows\SYSVOL\sysvol\<your domain>\Policies\PolicyDefinitions
Rename the current CredSsp.admx to CredSsp.admx.old
Copy the new CredSsp.admx to this folder.
On the same DC navigate to;
- C:\Windows\SYSVOL\sysvol\<your domain>\Policies\PolicyDefinitions\en-US (or your local language)
Rename the current CredSsp.adml to CredSsp.adml.old
Copy the new CredSsp.adml file to this folder.
Try your group policy again.
If Using a Central Policy Definition Store
You will need to copy the files to the central PolicyDefinitions folder in your Sysvol directory, see the following link;
Setup up a Central ‘PolicyDefinitions’ Store (for ADMX files)
Footnote
Don’t Simply Uninstall Windows updates KB41037272. and or KB4103718 – just because something works does not mean that’s what you should do!
11/01/2019
Thanks for the information. This is the most complete resource I’ve found so far.
I would ask if you could date your articles so that we could use that to help determine relevancy. Thanks for considering.
14/01/2019
Hi Ray,
I did used to date them, if you look at some of the older posts you will still see the dates on them. I stopped because Google was counting the date against the post.
P
28/04/2021
Hi PeteNetLive,
Your article “Windows RDP: ‘An authentication error has occurred’” is very useful and helpful for me that i was searching such kind of solution from 3 days.
I am very thankful to you.
Regards
Muhammad Shoaib(Pakistan)