I was getting this in my event log and users could no longer connect to RDS when trialling it –
Event ID – 1296
Remote Desktop Connection Broker Client failed while getting redirection packet from Connection Broker.
User : DOMAIN\USER
Error: Remote Desktop Connection Broker is not ready for RPC communication.
Event ID – 1306
Remote Desktop Connection Broker Client failed to redirect the user DOMAIN\USER.
I found the Fix for me was –
If you edit the properties of your Session Collection, click on the Security on the left. There is a setting for Security Layer. By default it is Negotiate. Try to set it to RDP Security Layer
My users could then connect again, i made the change in group policy for all TS (RDS) servers
– Computer Configuration\Administrative Templates\Windows Components\Remote Desktop Services\Remote Desktop Session Host\Security
– Edit ‘Require use of specific security layer from rermote (RDP) connections to Security Layer-RDP