Hello,
I know this problem and others like it have been posted a lot before, I have read all of them and tried everything but to no avail.
Currently I have a 2008 R2 Server Standard running RRAS behind a NAT firewall. All the appropriate ports and protocols are forwarded, all of the NIC drivers are up to date, Windows Server is up to date and the firewall's firmware is up to date.
All of the clients are running Windows 7 and all drivers and windows are up to date.
All of that being said, when the clients connect to the PPTP VPN they can access shares and resources, but file downloads and uploads are limited to less than 100Kbs (yes KBPS!). Clients on the LAN connected with wireless have transfer speeds at around 3Mbps and wired at around 10Mbps. As you can imagine, this is a problem.
What I have tried so far-
1. In order to test if ANY firewalls were causing the problem I disabled the firewall on the server, on the client and placed the server in the DMZ. No change.
2. Disabled all offloading options in both the NIC options and in the registry on both server and clients. No change.
3. Disabled all anti virus software. No change.
4. Forced Lan speed on server NICs, clients and firewall to 10 then 100 then 1000mbps. No change.
5. Disabled Smb2 in the registry on server and clients. No change.
6. Set up a virtual 2008 R2 server with HyperV and ran RRAS on it, forwarded the ports to it. Connected, but same speed issues.
7. Replaced all the cables. Nope, still no change.
8. Tested 5 different known good NICs and still no change.
9. Uninstalled and reinstalled RRAS about a dozen times. Still nothing.
10. Installed FTP services and tried connecting to the shares via FTP, still limited to less than 100kbps. Interestingly when I used Filezilla to connect to the site the speed shoots up to 500kbps and then hangs and drops back down to 100kbps. Like the speed is being throttled or something.
11. Called my ISP and yelled at them for throttling my VPN and FTP...It wasn't them, I was getting frustrated, sorry Rico.
12. Disabled TCP throttling (or something like that) in the registry. nope.
13. Replaced the firewall with a linksys E3000 router, then a Netgear 3700. Still nothing.
And probably more that I can't remember anymore. This has been an ongoing issue for months now. At this point I am thinking of reinstalling Windows Server, although it would be a huge hassle. I have never seen this server even come close to maxing out it's resources on any component. Two 8 core processors, 24 gigs of ram, Raid arrays, blah blah. All hardware tested and working great. Can anyone give me any advice? Or is it time to reinstall?