When users launch Window Terminal Services bookmarks via the PCS gateway, the connection fails with the following error message:
The remote computer that you are trying to connection to requires Network Level Authentication (NLA),
but your window 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 the NLA. On the Remote tab in System Properties, select "Allow connections from computers running any version of Remote Desktop.