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Windows 7 Networking Problems

Note: This article is a work in progress.

Things to Check when you're having problems with networking in Windows 7:

Task Offloading

The next thing to try, if that doesn't fix it, is to disable Task Offloading on your NIC. Go to the Advanced tab of the NIC's properties and disable everything related to "offload". Make a note of what you did and what the default settings were before you start, so that you can revert the changes if they do not help.

More Links

Stuff I found interesting while troubleshooting these problems:

  • http://www.opensourcec.org/blogs/bill_bosacker/archive/2009/03/05/4141.aspx - disable large send offload in Hyper-v
  • http://msdn.microsoft.com/en-us/library/ff571012.aspxj - using registry values to enable and disable task offloading
  • http://social.technet.microsoft.com/Forums/en-US/winserverhyperv/thread/bdc40358-45c8-4c4b-883b-a695f382e01a/ - very slow network performance with Intel NIC when TCP Large Send Offload is enabled
  • http://forums.microsoft.com/TechNet/ShowPost.aspx?PostID=3273603&SiteID=17 - How to disable TCP Offload options
  • http://www.sysprobs.com/windows-7-network-slow - Windows 7 Network Slow
  • http://www.experts-exchange.com/Software/Office_Productivity/Office_Suites/Q_25341398.html - Office documents slow to open from network when using Windows 7
  • http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Server/SBS_Small_Business_Server/Q_26223017.html - Slow network performance between Windows 7 client and Windows SBS 2008
  • http://movement3.wordpress.com/2010/02/24/slow-network-speeds-in-hyperv/ - Slow network speeds in Hyper-V
  • http://www.experts-exchange.com/Microsoft/Server_Applications/Q_25240647.html - Hyper-V R2 slow network performance