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June 18, 2010 / ffstefan

Windows Server 2008 R2 Network copy performance problem

Driving me Nuts: From my Mac, I can copy to a fresh Windows Server 2008 R2 install, but performance is really bad. The other way arround works much better: loging into the Server and copy from / to a Share on the Mac (using explorer) performs 4 times faster. Huh?

Reason: in my case (Snow Leopard 10.6.3 client with Windows Server 2008 R2 Server), forced digital signing by the server caused those the performance problems.

Solution: try to turn off forced Network signing in the 2008 Server. See this page (a german site, unfortunately)

Result: performance is 3times better (went from 15 MBytes/sec to 45 MBytes/sec)


  • although you can change the Registry Key on the server itself (MACHINE \System \CurrentControlSet \Services \LanManServer \Parameters \RequireSecuritySignature), you might need to adjust Domain or Local Policies in order to make those changes persistent after a reboot.
  • Same thing happened when I had a Windows XP client connected. After the changes, Performance boosted up.

One Comment

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  1. ffstefan / Jun 18 2010 9:10 am

    see samba “client signing = auto” config option

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