Friday, July 01, 2011

Accessing File Share is Very Slow with Windows 7 SP1

A user complained that accessing a file share on a particular server running Windows Server 2003 is extremely slow.  It was so slow that Windows Explorer just hanged!  Accessing other file shares on other servers running Windows Server 2003 and 2008 is working fine.

After some troubleshooting, the problem was resolved by disabling Windows Auto Tuning.

First try this and reboot.

C:\>netsh int tcp set global autotuninglevel=disabled

If it still does not solve the problem, try this and reboot.

C:\>netsh int tcp set heuristics disabled

Do remember to the command in elevated mode (Run as Administrator).  Otherwise you will receive the following error.

Set heuristics command failed on WSH The requested operation requires elevation
(Run as administrator).

We are not seeing this problem with Windows 7 without SP1.

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