Apple Desktop PC Security, For More Information, Check firewall settings if you cannot connect

Back to My Mac User’s Guide 8

December 2007

Check firewall settings if you cannot connect

Mac OS X Leopard has a built-in firewall, which is accessible from the Firewall tab of your Security preferences. You should verify that the firewall is set to either “Allow all incoming connections” or “Set access for specific services and applications.”

If you use a third-party firewall, you may need to modify the configuration to permit Back to My Mac to function correctly. In some corporate (or managed) network envi- ronments, you may need to consult your system administrator. When signing in to

.Mac and enabling Back to My Mac, TCP port 443 is used. For connections between machines, Back to My Mac typically uses UDP port 4500.

Security

Back to My Mac uses advanced authentication and security technologies to help prevent unauthorized access to your data and protect it while it is in transit over the Internet. When you first sign in to .Mac on a system running Leopard, you receive a digital certificate and private key for your “.Mac Sharing Identitity.” When you connect to another system using Back to My Mac, authentication is performed using the stan- dard Public Key Cryptography for Initial Authentication in Kerberos (PKINIT) protocol with the .Mac sharing identity. Communication between Back to My Mac computers over the public Internet is encrypted using IPSec.

For More Information

For more information about Back to My Mac and other .Mac services, visit www.apple.com/dotmac.

©2007 Apple Inc. All rights reserved. Apple, the Apple logo, AirPort Express, AirPort Extreme, iMac, iPhoto,

Keynote, Mac, MacBook, and Mac OS are trademarks of Apple Inc., registered in the U.S. and other countries. Finder and Leopard are trademarks of Apple Inc. .Mac is a service mark of Apple Inc., registered in the U.S. and other countries. This material is provided for information purposes only; Apple assumes no liability related to its

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