The Who's There? Firewall Advisor, from Open Door Networks, works with your Macintosh's firewall to help you analyze, understand and respond to access attempts detected by the firewall. Who's There? reads the log file produced by your firewall, and then allows you to:

• view access attempts based on several criteria, including date and risk level
• analyze access attempts to determine factors like risk level
• understand issues associated with specific access attempts, as well as broader security concerns
• summarize accesses by IP address and service type (port number)
• investigate details of the accessor's IP address, including their network's location and administrator's email address
• draft an email to the network administrator about the access

Who's There? analyzes access attempts and provides advice specific to the Mac OS X environment. Being Unix-based, Mac OS X introduces security risks that did not exist with previous versions of the Mac OS. Who's There? provides advice about these new risks.

There is much that's new and different in Who's There? 2.0. For details on new features, see the What's New section of this user's guide. One new feature is integration with our book, Internet Security for Your Macintosh. Chapter numbers and section names of relevant passages from this book are indicated throughout this User's Guide in blue italics.

Table of Contents

What's New in 2.0	Main window Display options Integration with the DoorStop X Firewall Integration with Internet Security for Your Macintosh The DoorStop X Security Suite
Getting Started	System requirements Basic concepts Installation & quick start Upgrade installations Purchasing Who's There? Related products
Main Window	Data filters Data view tabs Access history Copy Copy Special Summary by service Summary by IP address Sorting the data Action buttons Service Info Who's There? Draft Email Extra information on services Exporting data
Who's There? Dialog	WHOIS database search Draft email Map Service info Information about a service Accessing DoorStop X from Who's There?
Other Windows	General Preferences Log files log resetting & archiving search order year data choosing another log file Email template Display Preferences Icon size Highlight new lines Omit duplicate lines Columns Lookup IP address Online help
Using Internet Security for Your Macintosh	Browsing Information on a specific service The standalone version of "Internet Security for Your Macintosh"
Investigating Accesses	Investigating possibly malicious activity and other problems
Troubleshooting	Common problems & their solutions
Appendices	Mac OS X 10.4 built-in firewall Who's There?, firewalls and home routers Common port numbers Firewall log file formats