I am having great difficulty using remote desktop lately due to encryption errors which cause my session to end or to fail immediately when a session is started. This is not limited to a particular VPN client; it happens when no VPN is in use or when using SonicWall or OpenVPN. This is not limited to a particular version of Windows server; it happens with 2008 R2 and 2003 (don't know about 2012). This is not limited to my main workhorse, a Dell E6430; it also happens on a Dell E6400 and my HP Pavilion, all with Windows 7 Pro.
My location also does not matter, so I'm pretty certain that no firewalls or routers are to blame.
I am pretty much unable to RDP to any of my clients right now, so a solution is GREATLY appreciated.