I have a serer in the office and I connect from my house through a SSTP VPN. In my home computer (client) I add a new network folder, this networkf folder is in the server, that has a shared folder. I can transfer files, but is very slow.

For example, to transfer a folder that contain about 20 files, and in total are 11MB, it takes about 3 minutes. The server has a upload bandwidth of 890kbps. With teamviewer VPN takes about 1minute with 55 seconds.

The problema with the SSTP is that the transfer speed is not stable, bteween 0-200kbps. The problema is that when has to transfer a file, always the same, the speed drop to 0bytes/s and in this state is about 1-15 seconds and continue the transfer. Why?

So the total time at the end it's much more than the time that I need if the connection was stable and used all the bandwith. How I say, teamviewer VPN takes about 1:55 inteado of the 3:00 of SSTP.

Thank so much.

Hi ComptonAlvaro,

Please check if we have other program is connecting the Internet when we use the SSTP.
Additionally, we could contact the ISP to check the stability of network.

Regarding the slow SSTP performance issue, we could refer to the following thread similar to this issue.
http://social.technet.microsoft.com/Forums/en-US/8e8e4220-af25-4627-bed2-47db8c04d318/sstp-and-slow-transfer?forum=winserverNIS

Please take the following steps to fix this issue:
1. Add new registry key and value TcpAckFrequency=1 for all NICs on VPN server, so that we can reduce ACK delay.
2. Disable Windows 2008 SNP feature, and restart VPN server
3. Disable TCP Checksum offloading on VPN server

Hope it will be helpful.

Best regards,
Fangzhou CHEN

in this link: http://support2.microsoft.com/default.aspx?scid=kb;EN-US;321098

It says that a symptom is that if I use the file explorer the speed is slow but if I use the xcopy command in the cmd the transfer is fast. But in my case this is not true. This documentation is about Windows server 2003, I am using Windows 8.1 pro in the server and Windows 8.1 in the client.

So by the momento I don't modify the registry in the server because I am not sure if this solution will solve my problema.

Thanks.