RDP issues after latest Windows update

There was much shouting this morning when I realised that all of my RDP sessions were failing due to a pesky little error. They worked no problem at all yesterday, then I remembered .. windows updated last night!!

Said error was all but useless .. as everyone knows you can’t copy the url it shows in that dialog box.


A quick google resolved this with a very simple reg change.

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

I ran this with elevated privilege on my Windows 10 desktop and as if by magic I can now RDP again.

There are more fixes coming both Client and Server to resolve this, but the reg change will keep me going until Microsoft release those.


3 Replies to “RDP issues after latest Windows update”

  1. Strangely, I had exactly the same problem this morning – but on a machine I’d virtualised overnight! Hadn’t even crossed my mind it was due to a Windoze update!

    Thanks. You just saved me a bunch of time 🙂

  2. Hi Sharon,

    Indeed, this registry key will “solve” the issue people are seeing, but, leaves the server vulnerable to CVE-2018-0886.
    The best solution is to keep both server and client up-to-date with the latest security updates from MS. With this, no connectivity issues will rise and the vulnerability patched.

    The registry setting is only a 2nd solution for cases where the Server or client cannot be updated, for example due to company policy for patching, or people working on multiple environments, which they don’t manage, …
    In that case, the interoperability matrix in the following article shows which setting to use in which case.


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