Disable TCP Auto-Tuning to Solve Slow Network, Cannot Load Web Page or Download Email Problems in Vista
When Windows Vista is connected to high speed broadband Internet connection, there may be some incompatibilities and conflict problem or error such as the following:
- Poor intermittent network performance.
- Slow network loading.
- Unable to open and load some websites or webpages using Internet Explorer or Firefox, where the blue loading bar keeps running for a long time, but the pages fail to load.
- Java applets fail to download and open.
- Cannot receive email or download from POP3 mail server by email clients such as Thunderbird. No mail arrived although users may see the message “receiving 1 of 3 messages”, and eventually the receiving process will time out with the error number 0x800CCC19 timeout.
- Slow email sending or retrieval using Thunderbird and other clients.
The symptoms exist due to the new re-written TCP stack in Windows Vista that aims to take full advantage of hardware advances such as gigabit networking. Among the new feature in Windows Vista TCP/IP is Receive Window Auto-Tuning Level for TCP connections. TCP AutoTuning enables TCP window scaling by default and automatically tunes the TCP receive window size for each individual connection based on the bandwidth delay product (BDP) and the rate at which the application reads data from the connection, and no longer need to manually change TcpWindowSize registry key value which applies to all connection. Theoretically, with TCP auto-tuning, network connection throughput in Windows Vista should be improved for best performance and efficiency, without registry tweak or hack. However, this is not always the case, and may cause some Internet related issues and problems.
The workaround or solution to the above problem is to disable the TCP/IP AutoTuning in Windows Vista. Disabling auto tuning of TCP Windows Size should not cause any negative effects, only that TCP Window Size will always at default value without ability to optimization to each connection. Anyway, if there is any side effect after turn off auto tuning, simply re-enable back it.
Check the state or current setting of TCP Auto-Tuning
- Open elevated command prompt with administrator’s privileges.
- Type the following command and press Enter:
netsh interface tcp show global
The system will display the following text on screen, where you can check on the Auto-Tuning setting:
Querying active state…
TCP Global Parameters
———————————————-
Receive-Side Scaling State : enabled
Chimney Offload State : enabled
Receive Window Auto-Tuning Level : normal
Add-On Congestion Control Provider : none
ECN Capability : disabled
RFC 1323 Timestamps : disabled
Disable TCP Auto-Tuning
- Open elevated command prompt with administrator’s privileges.
- Type the following command and press Enter:
netsh interface tcp set global autotuning=disabled
Enable TCP Auto-Tuning
- Open elevated command prompt with administrator’s privileges.
- Type the following command and press Enter:
netsh interface tcp set global autotuning=normal
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[...] Re: Massive stutter issues!! You can try disabling autotuning on your server (only for vista and seven) Disable TCP Auto-Tuning to Solve Slow Network, Cannot Load Web Page or Download Email Problems in Vi… [...]
[...] issues is non-existent and no problem exists on your own system or on ISP network, and have tried various solutions specific to Vista network problems, try the following [...]
To turn auto tuning back on use the following commandnetsh interface tcp set global autotuning=normal
I tried entering the words you said in command prompt it keeps saying it is not recognixed as an internal or external command. I have Vista.
After trying every solution on the web, here is the solution that I found really effective: Set your NIC's duplex setting to "HALF" not FULL. Ex. If your on a 100mb network, set the problem machines to 100mb Half Duplex.
Before running this fix, my WAN/LAN was 1.5 mb/s / 100 KB/s – horrible!
After: 19/75 mb/s! A 13x/7500x fold increase!
"Don't care how/why it works, just that it works!"
I disabled this because I read that it would fix a problem I'm having. It didn't help and now when I try to turn it back on it says "Set global command failed on WSH The system cannot find the filed specified" Can anyone help me?
Thanks, the tutorial is easy to follow. The web seems slightly faster. I still need to test it more.
[...] Vista TCP Auto Tuning feature to minimize possible networking [...]
I could access every website on the internet except one (www.telemarket.fr) from one computer on my network. All the others could access it fine with the same IC. This worked like a charm and now I can access it.
This patch is useless with Vista SP1 and this "Safe Mode black screen" at each startup, because the tcpip.sys is not signed. (On 64bit and after SP1 on 32bit Vista too)
[...] To solve the problem, simply disable the Vista AutoTuning function which is the most common suggestion and fix for various network problems in Vista. [...]
[...] better performance for network downloading and web surfing. Other than the problems mentioned previously, Auto Tuning may also cause reduce the rate of establishing network connection, especially when [...]
[...] av TCP/IP Auto-Tuning ved å kjøre følgende kommando i kommandolinjen: netsh int tcp set global [...]
[...] Disable the TCP/IP Auto-Tuning feature by running the following command in command [...]
[...] the TCP/IP Auto-Tuning feature by running the following command in command [...]
It fixed my problem with email after updating to vista from xp. Email would not dl but 1 message and timeout.
I tried this because I was experiencing just these issues with Vista, but it didn't help. Thanks for trying to help, though…
[...] Namen "Autom. Abstimmungsgrad Empfangsfenster". ( sinngemäße deutsche Übersetzung dieses Artikels – vielen Dank an Autor.) __________________ Vista Update Pack 1.0 – Empfehlungs-Wettbewerb – [...]
Only do this if you experience problems though, because if your hardware supports these techniques properly, it's likely Vista will otherwise give improved networking performance compared to XP with this enabled. So it should be considered just a fallback solution.