I have a setup with one 2012 R2 DC and one 2012 R2 RDS server.
The DC is also a RDS Gateway.
The DC hold a share for folder redirection and one share for roaming profile.
When I try to login from the internet via RDS Gateway, The session report an event 20499 sayning that it had problems loading roaming profile because of a slow connection.
I do not get this error when I try to log on the RDS Host directly.
I have even tried to logon with VPN to my firewall, and then open the RD connection directly to the RDS server.....no error.
But When I try to go via the RDS Gateway, it tells me that a slow link has been detected.
I have uninstalled antivirus on both DC and RDS....but that did not solve the problem.