Only administrator can log into Remote Desktop Server from remote

I have a brand new Remote Desktop Server running on a Windows 2012 R2 server.  I followed the instructions on this site to configure.  So far it works great when I connect from a machine inside our network.  I can connect with any user account.  However, when I connect from a remote machine, whether on the internet or from a machine connected with the sonicwall VPN client, only the administrator can log in.  I know that it is not a firewall issue because if it was, the administrator would not be able to log in either.

I have created a security group called RemoteDesktopUsers (without spaces to differentiate from the built in group) and made that group a member of the built in Remote Desktop Users.  I have added the correct people to the group RemoteDesktopUsers.  This allows them to log in from a local machine, but they still cannot log in from a remote machine.  I have tried everything I can think of, and nothing seems to work.  Any help will be greatly appreciated.

Phil Goldwasser
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pgoldwasserAuthor Commented:
This has been resolved.  It was an issue of LmCompatibilityLevel in registry.
What is the exact error that non-administrative users see when they try to log in?
pgoldwasserAuthor Commented:
I resolved with help from another website.
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