The following fatal alert was received: 70

I have a server running Windows Server 2008 R2 which I use as a Remote Desktop Server. Following a reboot the System event logs are full of the following entries "The following fatal alert was received: 40" and "The following fatal alert was received: 70".

I have rebooted again but this hasn't cleared the issue. The server is fully patched.

I have noticed that it coincides with users logging on and logging off.

The Schannel 36887 errors come in a long burst of events preceded by three events.

Source:        Service Control Manager
Event ID:      7036
Description:   The Portable Device Enumerator Service service entered the running state.

Source:        Microsoft-Windows-Winlogon
Event ID:      7001
Description:   User Logon Notification for Customer Experience Improvement Program

Source:        LsaSrv
Event ID:      45058
Description:   A logon cache entry for user *UserName*@mydomain.LOCAL was the oldest entry and was removed. The timestamp of this entry was...

Can anybody suggest what is causing this?

Kind regards

David