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So I've installed VPN service that comes with Windows Server 2008. Works perfectly, etc.

When a client remote desktops to one of the private servers at the office, via VPN .. it's pretty slow.

Now - how long is a piece of string?

So before I get all the obligatory checks, I'll list the things from Mr. Obvious:

  • Our modem/router (fritz!box) has a data/graph that shows incoming and outbound bandwidth. Both directions are barely getting used when a client has RDP'd via VPN.
  • Our office internet connection is running at 21,9 Mbit/s download 1,3 Mbit/s upload.

I feel like it's maxing at .. modem speeds ??

Is there any tricks I can do to confirm this and possibly even fix this?

Update 1:

  • Client side connection is ADSL2+, currently running at 11MBit/s. Bandwidth is not 100% downstream/upstream at client.
  • only 1 person is RDP'ing (me). No one else is in the office right now. Office bandwidth both ways is nothing, except my RDP connection.

So i'm making the assumption that there's plenty of bandwidth to burn either way .. which was why i was thinking that issue is something else.

Is there any way I can prove that client and office are not maxing out the bandwidth's either way so we can cross that item off the checklist of possible reasons?

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Client side maybe the limiting factor. What is the client internet upload speed? –  John Siu Nov 14 '12 at 4:00
    
I'd also point out that 1.3 Mbit is a pretty slow upload for multiple clients. If your monitoring says it's not being utilized, fine, that's probably not the problem, but I wouldn't expect much of an improvement if you do ever get this fixed. A couple RDP sessions configured for LAN bandwidth, and you can kiss your entire pipe goodbye. As to what the problem actually is... not nearly enough information. Needs some basic troubleshooting before anyone here has anything more than shots in the dark to offer you. –  HopelessN00b Nov 14 '12 at 7:32
    
Updated opening post. –  Pure.Krome Nov 14 '12 at 12:11
    
Just an idea, if you don't need the VPN overhead, consider using Terminal Services Gateway (Remote Desktop Gateway). Windows VPN essentially connects the machine to the network, which from looking over your question, it doesn't sound like you need it. If all you are trying to do is get the user to the Terminal Server, this is a much simpler way to do it. –  MikeAWood Nov 21 '12 at 1:11
    
that's an interesting suggestion :) but i also connect to other systems (and not via RDP) –  Pure.Krome Nov 21 '12 at 7:08

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