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We have seen several servers receiving a lot of logon attempts from hackers (several dozen per minutes), and this spams Windows Remote Desktop Service, thus causing the Internal Error message when trying to connect.Ĭhange this GPO on the Windows server: gpedit.msc > Computer Configuration > System > Credential Delegation > Encryption Oracle Remediation > Only Updated Clients > Force Updated Clients

If one of your customer is still facing Internal Error message, then you might want to check if he has a lot of invalid logon attempts. run 'MSTSC.exe', open the options, then go to the Experience tab and UN-select 'Reconnect if the connection is dropped'.update TSplus to its most up-to-date version,.update Windows to its most up-to-date version with all latest KB updates installed,.finally, reboot the terminal server or use this command : gpupdate /force.then disable 'Require user authentication for remote connections by using Network Level Authentication policy'.then enable 'Require use of specific security layer for remote (RDP) connections' and select 'RDP' as Security Layer.navigate to Computer Configuration > Administrative Templates > Windows Components > Remote Desktop Services > Remote Desktop Session Host > Security.

To configure the policies on your terminal server please follow these steps: You will need to configure group policies on your server. The Dev Team has investigated the 'an internal error has occurred' error originated from the Windows Update KB4457139.