The remote computer that you are trying to connect to requires Network Level Authentication (NLA), but your Windows domain ...

The remote computer that you are trying to connect to requires Network Level Authentication (NLA), but your Windows domain controller cannot be contacted to perform NLA. For assistance, contact technical support or your network administrator.

Disabling NLA makes your connection less secure. However, if you are an administrator on the remote computer, you can disable NLA. On the Remote tab in System Properties, select "Allow connections from computers running any version of Remote Desktop".