Tag Archives: windows

Fix: RDP error The function requested is not supported

When trying to connect to a server or machine via Remote Desktop Connection you will get the below error which is strange as one would normally connect without any issues.

"Remote Desktop Connection
An authentication error has occurred.
The function requested is not supported
Remote computer: XXX.XXX.XXX.XXX"

After some research I found that this is due to a Windows Update patch which was released recently that is CVE-2018-0886 for RDP. So if the workstation was updated and the server was not yet.

There are two options for this.

Patch the server with the CVE-2018-0886 (Recommended)

Update the policy on the local computer (Not recommended but in case of emergency)

  • On the computer open Group Policy
  • Go to Computer Configuration > Administrative Templates > System > Credentials Delegation
  • Change Encryption Oracle to Remedition to Enabled
  • Change Protection Level to Vulnerable

Open MSTSC and you will be able to connect to the server.

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Fix: No Suitable Directory Servers Found when accessing OWA and ECP

When accessing ECP or OWA on your Exchange server you will be the below Server Error saying that No Suitable Directory Servers Found in Site and connected Sites. On the Event Viewer you will get the error 0x80040a02 (DSC_E_NO_SUITABLE_CDC).

The below solution if for Exchange 2003, 2007, 2010 and 2013. Open the Domain’s Group Policy Management and edit the Default Domain Controllers Policy or your server policy as below.

Computer Configuration
Policies
Windows Settings
Security Settings
Local Policies
User Rights Assignment
Mange auditing and security log
Add ‘Exchange Servers‘ or ‘Exchange Enterprise Servers‘ to that policy.

Restart the Exchange server to apply the computer configuration.

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