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:Credssp error when connecting to Windows Server

Last Updated:Dec 10, 2020

Problem description

When you log on to a Windows Server by using Remote Desktop Connection, the following message is displayed. After troubleshooting, make sure that the username and password are correct and you cannot log on after resetting the password.

Authentication error, requested function not supported
This may be due to CredSSP encryption Oracle remediation.

Possible cause

This problem is not caused by incorrect username and password, nor by Alibaba Cloud, but by the update patch Microsoft has released for Windows. This problem basically only occurs in Win10 operating system and has no impact on Win7 and other operating systems.


  1. Log on to the Windows system client, click start, find and click run, enter gedit.msc, and click OK to open the local group policy editor.
  2. Then select administrative templates in computer configuration in the column on the left>System>Credential assignment, and then double-click encrypted Oracle remediation in the column on the right.
  3. Change not configured to enabled, and then change the protection level from mitigated to vulnerable, and then click apply.>OK.

Application scope

  • Simple Application Server