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Facts: We are running a Windows 2003 AD environment. I have a server 2003 R2 with it's default admin shares: C$ and D$ Both these shares only have : sharing as Default Share, while Permissions can't be changed (as expected) and it's security settings are for only as the local computer administrator.

On the local computer, I have domain admins as group of administrators.

However, I found that ANY computer that is connected to the network, can access the shares by: \servername\d$ with full access rights - Frightening, but I have no idea why it's like that. There are NO other groups that can access in the security tab.

If I remove the share, as suggested in Importance of default windows shares off-course it can't be accessed. By restarting the server, creates the shares again - and again - any computer that is on the net can access the shares. The computer I am connecting to test, is NOT in the domain, it's a workgroup computer, with a local administrator access.

Where can I start and look for a solution? I need to have this hole fixed.


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Silly question, are you using the same administrator password on all your machines? – Nate Mar 18 '12 at 11:21
I have changed all local administrators name, and there is NO "Administrator" on a local machine, but yes, they all use the same password. - which led me (off course) to test - so yes, that's the problem. That lead me that if by any chance, any guest will arrive to my network, will have the same admin name, and the same password - he will gain access to the shares (if it's using authenticated users and not domain users) thanks. *make that an answer - you'll get the answered. – Saariko Mar 18 '12 at 11:36
up vote 1 down vote accepted

Make sure that you are not using the same Administrator password on all of the machines (note renaming it doesn't matter as it still uses the same SID).

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I did have the same local admin password for all my machines, the same goes for my Test machine. So, changing the Test machine's password (which simulates how a guest will probably be on my network) actually solved this. thanks – Saariko Mar 18 '12 at 12:07

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