Tech in the 603, The Granite State Hacker

Windows Authentication fails due to machine name alias issue

Another tidbit I ran into recently that I hit once long ago, and don’t want to forget it again:

I have a VM who’s name I changed.  Trying to develop a WCF webservice for an SOA initiative, I ran into a completely inexplicable authentication failure when I tried to authenticate with my own local user on the machine.

Turns out the quick & easy fix (identified in this post from MS ) ended up pointing me to the solution of:


REG_MULTI_SZ key “BackConnectionHostNames” to my registry at

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa\MSV1_0 . 

One alias per line…

I added a couple lines for various aliases that I use for the machine, enabling me to authenticate as {alias}\{userName}, locally, on the machine.

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