automatic logon

Definition of automatic logon in The Network Encyclopedia.

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What is Automatic Logon?

A logon process whereby the user gains access to the network through user credentials previously stored in the registry. Automatic logon can be enabled on a machine running Microsoft Windows NT by editing the registry.

Use registry editor (regedit.exe) to open the following key

\Windows NT

and modify or create the following REG_SZ type values:

  • DefaultDomainName
  • DefaultUserName
  • DefaultPassword
  • AutoAdminLogon

Set AutoAdminLogon equal to 1 to enable automatic logon.


The automatic logon process can be bypassed by holding down the Shift key upon startup or logoff.


Use extreme care when making changes to the registry, as improper use of Registry Editor can make your system unbootable.