Windows Vista forum


Account unknown(S-1-5-5-0-649118)

by liashwinnux / April 15, 2012 11:06 AM PDT


Whenever i am downloading any file or creating any file/folder then an unknown account (Account unknown(S-1-5-5-0-649118) is created in the property/security section.

Please let me know if anyone is having idea how to get rid of this ?

Thanks for your time and help.


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All Answers

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Property/Security section.
by MarkFlax Forum moderator / April 15, 2012 10:11 PM PDT

What section is this Property/Security section? I'm not at all clear on what you found.

It may be that this is some sort of .Net Framework account what Windows sometimes create, in which case it can safely be ignored.


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by liashwinnux / April 16, 2012 4:46 AM PDT

For example, when i download any word document file from internet to my laptop. After downloading the word document to my laptop, i right click on the word document - properties - security.

Here i am seeing Account unknown(S-1-5-5-0-649118) is created. This is happening for not only downloaded files but also if i create any new folder or new file on my laptop, this Account unknown(S-1-5-5-0-649118) is assigned to those newly created folders/files.

Please let me know if you need any more information.

Thank you for your help.

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Re: security settings
by Kees_B Forum moderator / April 16, 2012 5:12 AM PDT
In reply to: Folder

With me here, I only see 4 lines in the "Groups and users":
- Verified users
- Administrators
- Users
What do you see?

It looks like the interal code of some Windows account or so that you deleted. Since it doesn't seem to exist anymore, I shouldn't worry about it having certain access permissions to your files.


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Without knowing a whole lot more ...
by Edward ODaniel / April 18, 2012 4:53 AM PDT
In reply to: Folder

than you should be telling us about your specific internet and network configuration we are going to have to let you discover your own DEFINITIVE answer. This link should help:

For a simple answer I personally would say to ignore it and not worry about it because the S 1 5 5 0 indicates an NT Authority logon session SID (Security Identifier). This is a well known SID and is normal in Windows - it DOES NOT signify any security lapse or "hacking" or anything else of concern. Modifying access permissions though could cause some unforeseen problems with the files.

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