Windows 7 network file transfer absurdly slow
See info about a HotFix @ http://support.microsoft.com/kb/2675785Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.
March 24th, 2012 3:28pm

See info about a HotFix @ http://support.microsoft.com/kb/2675785Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.
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March 24th, 2012 10:26pm

I know there are plenty of other posts about slow network file transfer. Here, elsewhere, I can't say I read them all but most are referring to slow down to 1MB/s. I am getting <20KB/s. If I transfer a very small file (less than 100KB) it would start quickly then slow down to <20KB/s. all subsequently network file transfer would be slow, a reboot is needed to reset this. If I transfer a large file it would be stuck on calculating for a long time and then begin with <20KB/s immediately. This is a fairly newly built desktop. Realtek gigabit on-board LAN of ASRock Extreme3 gen3. I have tested network file transfer to and from a Windows 7 laptop and a MacBook Pro, so I am fairly certain it is the desktop's problem. The slow speed only happens with one direction, outbound from the desktop, regardless of whether I initiate the file transfer action from the origin or the destination. Inbound network file transfer and internet speeds are fine, so I don't think this is a hardware issue. Remote Differential Compression is off. Drivers are up-to-date from ASRock's website. I am getting 74.8MB/s internet upload speed from speedtest.net (http://www.speedtest.net/result/1852752479.png). Inbound network file transfer I can get around 10-15MB/s. I looked everywhere and can't find symptoms that fits my case well. I'd be cheering if I can get 1MB/s. Well, maybe not, but at this point it is more efficient for me to upload everything to the Internet and download them again than to use local file transfer, which is just absurd. I am hoping this community has some insight for me to troubleshoot this. I don't see anything obviously related from the Event Viewer, and beyond that I just don't know where else to look. Any suggestions are greatly appreciated, thank you in advance.
March 25th, 2012 1:53am

Following the logic from the HotFix article, I tried disabling TCPAuto-Tuning and Windows Scaling heuristics via netsh. Seems to have no visible effect, 13MB/s from laptop and 17KB/s to laptop, similar to what I had before.
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April 7th, 2012 11:46am

Spoke too soon. It appears after reboots on both pc's my transfer speed has again slowed down to mere kb's/sec. Tried reinstalling the hotfix again, but it say's it is already installed on pc.
April 7th, 2012 3:50pm

It appears to have something to do with Homegroup. I set up a homegroup for sharing between pc's on the network and have given file sharing permissions to various folders on the pc's. It is the transferring of data between these newly shared folders within homegroup that is very slow. If I transfer between the public or default folders within users, the speed is much faster, 70-80mb/sec. Sorry, I did not mean to highjack this post. I realize now, I should have started another post. My apologies.
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April 7th, 2012 4:38pm

Tried the hotfix and other suggestions with no observable change. Instead of hoping for updated driver from ASRock, I downloaded a recently updated reference driver from Realtek (v7.053, 2012/3/22). This seems to have solved my speed in the mean time I am now getting ~13MB up and down. While I guess this is still pretty slow for a gigabit network, at least it is usable. If anyone else using ASRock Extreme3 Gen3 come across the same problem, try using Realtek's NIC driver instead of the one from ASRock.
April 7th, 2012 9:49pm

I had the same problem as mango shake, on two desktops running windows 7. Was previously transferring at 16-25kb. Very frustrating! I downloaded the hot fix and installed on both pc's. Speed problem fixed, transferring now at up to 1gb. Wow! Thank you so much for providing this hotfix RickDee. Much appreciated. :)
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April 7th, 2012 11:30pm

Hi, Firstly, would you please try again to install the HotFix instead of disabling TCPAuto-Tuning and Windows Scaling heuristics via netsh manually. If issue persists, please try following: 1. Test the issue in Safe Mode with Networking. 2. Disable "Large Send Offload". How to: 1) Open an elevated command prompt and press Enter: netsh int ip set global taskoffload=disabled. 2) Disable and re-enable the network interface or reboot your system. 3) Run the following command in an elevated command prompt to confirm the command above is successful: netsh int ip show offload 3. Check the value of Speed & Duplex is Auto in Advanced Properties of the NIC. If not, please let us know your value. 4. Check if Flow Control is disabled in Advanced Properties of your NIC. 5. Go to your Start Menu, search for Local Security Policy and run it as administrator. Under Security Settings -> Local Policies -> Security Options. 1) Open Network security:Minimum session security for NTLM SSP (including RPC based) Clients, unselect Require NTLMv2 session security and Require 128-bit encryption. 2) Do the same operation to Network security:Minimum session security for NTLM SSP (including RPC based) Servers. 3) Open the policy Network Security LAN Manager authentication level. Locate and select the option Send LM & NTLM use NTLMv2 session security if negotiated. Click Apply, and close out of all policy management windows. Hope this helps. If a post solved your problem, click Mark as Answer on the post. If a post helped you, click "Vote As Helpful" on the left side of post.
April 8th, 2012 5:44am

Thanks, your advice kept me sane. I had the same problem with the Asrock 970 extreme 3, the hotfix failed. Your driver solution saved the day. Thanks again.
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April 11th, 2012 8:53pm

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