In this guide, we will teach how to fix “An authentication error has occurred:
This error appears when you try to establish a rdp connection from your computer and can’t rdp through your PC (remote desktop connection/remote desktop client from Microsoft). This solution will work on Windows (Windows Vista,Windows 7, Windows 8, Windows 8.1, Windows 10 (Windows 10 Home, Windows 10 1803, windows 10 enterprise, windows 10 pro), Recent Windows Server versions (Azure, Server 2012 r2, Server 2016, Server 2008 r2, Windows Server 2016), including all 32-bit and 64-bit versions in this list).
The Credssp encryption oracle remediation problem also appears on some devices that are updated operating systems (some Windows 10 updates/after updates). Credssp encryption oracle remediation is not available on your device if you are using an older version of the Microsoft Windows operating system.
Sometimes a credssp encryption Oracle remediation error shows when you try to rdp to Windows (Windows server or other OS) in VMware or Oracle VirtualBox. Credssp encryption oracle remediation patch is also available on the latest Windows update (may not be available for all devices).
Please use the following methods for Oracle remediation error resolution.
Method 1 uses Group Policy Editor (GPO) if you have Encryption Oracle Remediation available in Group Policy Editor;
Run the local GPO editor: gpedit.msc
Go to the GPO section Computer Configuration -> Administrative Templates -> System -> Credentials Delegation;
Locate the policy with the name Encryption Oracle Remediation, enable the policy and set the Protection level to Vulnerable;
Update the policy setting on the computer (run gpupdate /force command)
Method 2 uses Reg Key/Regedit if Encryption Oracle Remediation is not available in Group Policy Editor;
1) Go to Windows Search
2) Search Regedit
3) Click On Regedit
4) Expand HKEY_LOCAL_MACHINE
5) Expand SOFTWARE
6) Expand Microsoft
7) Go To Windows
8) Expand Windows
9) Expand CurrentVersion
10) Go To Policies
11) Expand Policies
12) Expand System
13) Right Click On System
14) Select New
15) Select Key
16) Type CredSSP
17) Right Click On CredSSP
18) Select New
19) Select Key
20) Type Parameters
21) Right Click And Select New
22) Select DWORD (32 bit) Value
23) Type AllowEncryptionOracle
24) Right Click On AllowEncyptionOracle
25) Select Modify
26) Enter Value Data 2
27) Select Decimal
28) Click OK
29) Close Registry Editor
If you are getting this error using Oracle VirtualBox, you may need to install the Oracle VM VirtualBox extension pack and Windows remote desktop port on your router if you are on wifi.
After using one of these methods on your PC, hit mstsc in Run (in Windows) to start rdp (Windows Remote Desktop Connection).
