Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I've been searching for a while and am having trouble finding the answer.

I have an IIS6 server running WebDAV for HTTP PUT uploads through anonymous access. The uploads work fine and the newly created files have a Creator/Owner of <machinename>\IUSR_<machinename> as expected. The problem I'm having is that I can overwrite files but I can't find the permission that allows it.

For a file, if I do a Get-ChildItem <filename>.txt | Get-Acl | fl in Powershell, I have the following info:

PS x:\> Get-ChildItem <somefile>.txt | Get-Acl | fl

Path   : Microsoft.PowerShell.Core\FileSystem::x:\<somefile>.txt
Owner  : BUILTIN\Administrators
Group  : CCTLAB\Domain Users
Access : BUILTIN\Administrators Allow  FullControl
         NT AUTHORITY\SYSTEM Allow  FullControl
         NT AUTHORITY\Authenticated Users Allow  Modify, Synchronize
         BUILTIN\Users Allow  ReadAndExecute, Synchronize
Audit  :
Sddl   : O:BAG:DUD:AI(A;ID;FA;;;BA)(A;ID;FA;;;SY)(A;ID;0x1301bf;;;AU)(A;ID;0x1200a9;;;BU)

I'm thinking that maybe IUSR_ is in one of these groups, but I'm not certain which one. Is IUSR_ a member of Authenticated Users or Users, maybe?

share|improve this question

migrated from Dec 19 '13 at 2:54

This question came from our site for computer enthusiasts and power users. – techie007 Dec 16 '13 at 19:30
Also, are you sure it's using the IUSR user and not the IWAM user? – techie007 Dec 16 '13 at 19:36
up vote 0 down vote accepted

IUSR_<machinenname> is a member of Authenticated Users and Users group (which makes sense; the IUSR account has a sid and all that). techie007's link is quite helpful.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.