How to Fix This could be due to CredSSP encryption oracle remediation Error. In some security updates, Microsoft has increased security, so we may experience this when connecting remotely using Remote Desktop Connection failed as follows:
An authentication error has occurred.
The function requested is not supported
Remote computer: VPS1
This could be due to CredSSP encryption oracle remediation.
If before, users could easily connect to the server using RDP remotely to perform software updates and upgrades, but due to a security flaw CVE-2018-0886 | CredSSP Remote Code Execution Vulnerability, so in May 2018, Microsoft increased security in the updated version. For the purpose of changing the default setting of Encryption Oracle Remediation from Vulnerable to Mitigated to protect the server more securely. This means that applications where users use CredSSP will be more secure, of course, they will not be reverted to an unsafe version.
However, the new update accidentally affected the Remote Desktop application, making users unable to connect to the server or VPS. Therefore, the system will report an error with the message mentioned at the beginning of the article. Specifically, the following two cases occur:
+ The user (RPD client) has updated to the new version (updated patch), trying to connect to the server that has not been updated will result in the machine being suspended and unable to be physically accessed remotely.
+ The user has not been updated with the patch, the server has updated the patch, then RDP works normally. Only sessions are vulnerable.
And when the user and server have been updated with the patch, of course the RDP connection will be completely safe with the new version.
What is Remediation?
Remediation means to fix, fix and recover from errors. This is a buzzword in network administration. When you see the system showing the above message, you can fix the errors according to the following instructions
Instructions to fix this could be due to credssp encryption oracle remediation by lowering the protection level
The most comprehensive way to handle it is that you update the new version related to CredSSP on both the server and the RPD client. However, in case you try to connect Remote Desktop to a server that does not have an update, then on the client computer you can use the way to lower the application security level (policy), by selecting the level of application security. “Vulnerable” for “Encryption Oracle Remediation” at Group Policy.
By lowering this protection level, you will be able to easily access the server and update the version to avoid the error situation again.
The steps to fix the error are as follows.
How to fix the error This could be due to CredSSP encryption oracle remediation
Step 1: Press the key Windows + Rand typeregedit
Step 3: Inside the CredSSP key, create more key Parameters
Step 4: In Parameters create DWORD (32 bit) Value and name it AllowEncryptionOracle
Step 5: Double click on AllowEncryptionOracle and enter Value data as 2
Complete the above steps exit Registry Editor and proceed to reconnect.
How to Fix This could be due to CredSSP encryption oracle remediation Error