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Not applicable

Terribly slow SSL VPN

I set up my SSL VPN and am able to auth and roam around all the shares on the network from home but it is ridiculously slow. I copied a 100MB file from a mapped share to my desktop and it took about 35 minutes. That share happens to be a public FTP folder so I used Firefox to navigate to the folder and downloaded the same file in about 10 minutes. I also compared network speed tests before and after connecting with the VPN client. Before it was about 3/1.5 and after it was .4/.1...Is anyone else having issues like this?
13 REPLIES 13
mbrowndcm
New Contributor III

You keep saying that you' re trying to provide good throughput to a file server; so what the hell is testing internet bandwidth gonna do for ya? Here' s what I would do if I was you: 1) Get split tunneling working -I didn' t have to do anything more than check off " split tunnel..." so contact fortigate support. 2) Test connectivity with iperf Testing connectivity with iperf: -Connect with the VPN -Download iperf for windows: http://www.noc.ucf.edu/Tools/Iperf/iperf.exe -run iperf -s on the File server -run iperf -c [IP address of the file server] on the VPN client -run it nine more times keeping the results handy -average these ten results -run iperf -s on the VPN client -run iperf -c [IP address of the VPN client] on the file server -run it nine more times keeping the results handy -average these ten results And you' ve tested the throughput to and from your file server.
" …you would also be running into the trap of looking for the answer to a question rather than a solution to a problem." - [link=http://blogs.msdn.com/b/oldnewthing/archive/2013/02/13/10393162.aspx]Raymond Chen[/link]
" …you would also be running into the trap of looking for the answer to a question rather than a solution to a problem." - [link=http://blogs.msdn.com/b/oldnewthing/archive/2013/02/13/10393162.aspx]Raymond Chen[/link]
Not applicable

Lol I was just running the bandwidth test because I was curious. I also tested downloading and uploading files between the remote machine and the mapped drive of the file server and there was no improvement. Ill do that with ipref. I was doing more reading and found some good info on why SSL VPN is so slow. Im also going to try and configure the IPSec VPN and see if I get any improvements.
mbrowndcm
New Contributor III

Cool. May I suggest testing the speed of both? In fact, I may do this myself soon.
" …you would also be running into the trap of looking for the answer to a question rather than a solution to a problem." - [link=http://blogs.msdn.com/b/oldnewthing/archive/2013/02/13/10393162.aspx]Raymond Chen[/link]
" …you would also be running into the trap of looking for the answer to a question rather than a solution to a problem." - [link=http://blogs.msdn.com/b/oldnewthing/archive/2013/02/13/10393162.aspx]Raymond Chen[/link]
digimetrica
New Contributor

I have same problem: I am using split tunneling and changed MTU value but nothing seems to solve this speed issue (3.00 mr7). The speed loss, using a bandwidth meter, is related to the upload (client vpn to server), not the download. I still can' t figure out where the problem is
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