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While trying to join a machine which had previously been on a Windows Server 2003-hosted domain to a new domain hosted on Windows Server 2003 R2 (not sure if the change in OS is the cause of this issue), I kept getting “Access Denied”.

In C:\windows\debug\netsetup.log it says:

NetUseAdd to \\DC_FQDN\IPC$ returned 5
NetpJoinDomain: status of connecting to dc '\\DC_FQDN': 0x5
NetpDoDomainJoin: status: 0x5

The solution was to fire up regedit and change the value of HKLM\SYSTEM\CurrentControlSet\Services\lanmanserver\parameters\enablesecuritysignature to 1, and restart.

Edit: Do this after leaving the original domain for a workgroup, because doing that resets it to 0.


    • Chris
    • Posted July 17, 2007 at 11:48
    • Permalink

    Thanks, works a treat.

    • Martin Wells
    • Posted December 12, 2006 at 01:52
    • Permalink

    YOU ARE THE MAN!!! THANKS SO MUCH !! Fought this all day until I got to your site!!!

    • Posted November 9, 2006 at 08:48
    • Permalink

    Thanks, we had this issue yesterday and this fixed it.

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