- Put a more stringent password policy in place.
- Audit the use of permissions and access so you know who is doing what.
- Make sure the core operating system and any applications are properly patched and up to date.
- If you're using Internet Information Services (IIS), make sure it's locked down and that the content it's serving isn't sensitive.
Security isn't a task that can be completed; it's an ongoing process without end. You need to be ever vigilant, though congratulations are in order for recognizing you need to take some steps to protect yourself.
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If your server has been penetrated by an unwanted user, then the only surefire way to eliminate the threat is to format the hard disk of the server and re-install from scratch. As the old security tenet goes, "once the hacker has access to your machine, it's not your machine anymore."
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