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Microsoft has released a few security patches in March 2018 khổng lồ fix the vulnerabilities for the CredSSP.. (Credential Security Support Provider Protocol) used by the Remote Desktop Protocol in Windows Server. But a recent update has made CredSSPhường Authentication error in RDP & caused hindrance to many users.

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Microsoft pushed the update of May 2018 to harden the security by making it mandatory for both client và hệ thống computers khổng lồ have the update installed. This resulted in windows servers not accessible via RDPhường. for many users và made many khổng lồ reboot their servers lớn fix the issue thinking it as a VPS side issue. This blog helps you on how to lớn fix the CredSSP. Authentication error in Remote Desktop Protocol (RDP).

What is CredSSP?

“CredSSP” or “Credential Security Support Provider Protocol” is a security tư vấn provider which helps khổng lồ securely delegate user credentials from a client computer to a windows hệ thống by using TLS (Transport Layer Security) as an encrypted pipe.

Why the update?

The update in May is made khổng lồ correct how CredSSP.. validates requests during the authentication process. Microsoft has found a credssp error in rdp and found a fix for the vulnerability by mandatory requiring to lớn update both the client và hệ thống computer lớn work properly.

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An authentication error has occurred.

The function requested is not supported

Remote computer:

This could be due to CredSSP encryption oracle remediation.For more information, see the link

This error is due to the windows update not installed either on the VPS or on the client computer.

How to fix it? 

To fix the issue, you need to lớn uninstall the update và roll bachồng lớn an older version. But rolling baông chồng to lớn an old version is not a best practice. You can fix this by changing the group policy in the local computer khổng lồ use the vulnerable setting

1. Go lớn “Run” (Win Key + R)2. Type “gpedit.msc” và cliông xã “Enter”


3. Go khổng lồ Computer Configuration -> Administrative Template -> System -> Credentials Delegation -> Encryption Oracle Remediation


4. Double Clichồng on “Encryption Oracle Remediation”, choose “Enable” and change protection cấp độ khổng lồ “Vulnerable” & cliông xã “Apply” or “Ok”


You can also fix the issue with the help of a Windows Registry Editor

1. xuất hiện Windows Registry by typing “regedit” in “Run”2. Navigate to lớn Computer -> HKEY_LOCAL_MACHINE -> SOFTWARE -> Microsoft -> Windows -> CurrentVersion -> Policies -> System -> CredSSP. -> Parameters


3. Doublecliông xã on the Key “Allow Encryption” Change the value khổng lồ “2”


This method also gives the same output as achieved through the Group Policy Editor. You may use the below table from Microsoft khổng lồ compare the installed windows update for CredSSPhường.

Operating systemTSpkilogam.dll version with CredSSP updateOperating system TSpkilogam.dll version with CredSSPhường update CredSSP update
Windows 7 Service Paông chồng 1 / Windows Server 2008 R2 Service Paông chồng 1 6.1.7601.24117 KB4103718 (Monthly Rollup)6.1.7601.24117KB4103718 (Monthly Rollup)KB4103712 (Security-only update)
Windows Server 20126.2.9200.22432KB4103730 (Monthly Rollup)KB4103726 (Security-only update)
Windows 8.1 / Windows Sever 2012 R26.3.9600.18999KB4103725 (Monthly Rollup)KB4103715 (Security-only update)
RS1 – Windows 10 Version 1607 / Windows Server 201610.0.14393.2248KB4103723
RS2 – Windows 10 Version 170310.0.15063.1088KB4103731
RS3 – Windows 10 170910.0.16299.431KB4103727