![]() ![]() Let’s take a look at the description of the process involved in relation to each of the listed solutions. If you’re faced with Remote Desktop Connection error, An Authentication error has occurred, The Function requested is not supported error message, you can try our recommended solutions below to resolve the issue. RDP Authentication error has occurred, Function requested is not supported # In other words, if the client computer has the security update installed but the server computer was not updated with the security update (or vice versa), the remote connection was unsuccessful and user received above-mentioned error message. The patch updated CredSSP authentication protocol and Remote Desktop clients for all affected platforms.Īfter installing the update, patched clients were not able to communicate with unpatched servers. To patch this security risk, Microsoft released a security update addressing the vulnerability by correcting how CredSSP validates requests during the authentication process. ![]() So any application that depends on CredSSP for authentication was vulnerable to this type of attack. An attacker who successfully exploits this vulnerability could relay user credentials to execute code on the target system. Recently Microsoft found that a remote code execution vulnerability (CVE-2018-0886: encryption oracle attack) exists in CredSSP versions. You can fix the ‘An authentication error has occurred, This could be due to CredSSP encryption oracle remediation’ error by using Registry or Group Policy Editor. Remote computer: Computer_Name or IP_AddressThis could be due to CredSSP encryption oracle remediation.For more information, see Īs you can see from the image above, the error message is caused by the CredSPP Encryption Oracle Remediation. ![]() When the Remote Desktop Connection authentication fails, you’ll receive the following error message Īn authentication error has occurred.The function requested is not supported.
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