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"DisableLoopbackCheck & SharePoint: What every admin and developer should know" advises to disable ("infamous") "loopback check" completely on dev machine by following

The latter tells:

  • "4. Right-click Lsa, point to New, and then click DWORD Value"

Well, right-clicking "New" on "LSA" in Windows Server 2008 R2 Datacenter doesn't have "DWORD Value" but only:

  • "DWORD (32-bit) Value"
  • "Qword (64-bit) Value"

Which one should I set?

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you should dissociate the storage size of the value from the processor architecture. Running on 64 bits does not means you have to store values in 64 bits. I guess this is simpler for Microsoft because they have a single method to read this value that returns an int, and easier for us, because the same procedure applies for all – Steve B Jun 4 '12 at 13:45
up vote 3 down vote accepted

DisableLoopbackCheck should be a "DWORD (32-bit) Value"

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