FaceTime might be easy but network traversal can be hard, which is why Apple has posted a knowledge base article to help you get your FaceTime behind a firewall.

If the Wi-Fi network router that you are connected to uses a firewall or security software to restrict Internet access, contact the network administrator and reference this technical article. To use FaceTime on a restricted Wi-Fi network, port forwarding must be enabled for ports 53, 80, 443, 4080, 5223, and 16393-16472 (UDP).

The Wi-Fi network administrator can refer to their router, firewall, or security software documentation for information on configuring port forwarding.

If you encounter issues using a Wi-Fi network, use standard Wi-Fi network troubleshooting to resolve interference and other issues.

Have you had any firewall issues with FaceTime at home, at school, or at work? If so, did this tip help?

[Apple Knowledge Base via 9to5Mac]

Apple has posted a knowledge base article support note for users whose Exchange ActiveSync mail, contacts, and calendars are no longer syncing post-iOS 4 update.

Here are the symptoms as described by Apple:

Immediately after updating to iOS 4, some users may notice that Exchange ActiveSync Mail, Contacts, or Calendars do not sync, or sync very slowly. In addition, some Exchange Server administrators may notice their servers running slowly.

And the solution:

To work around this issue, users should install a configuration profile from Apple that increases the amount of time the iOS 4 device will wait for the Exchange Server to respond to its sync requests. For best results, the profile should be installed on as many iOS 4 devices at your company as possible.

To install the profile:

1. Use Safari on your iOS 4 device to download the configuration profile. It may be easiest to read this article with your iPhone or iPod touch and tap the download link there, but you may also email the attachment to another email account on your iOS 4 device, and tap the attachment to open it.
2. Tap Install to install the profile, and enter your passcode if prompted.
3. A warning message will appear because the profile is not signed. Tap Install Now. Tap Done to complete the installation, then power off your device and power it back on.
4. Wait for your Exchange data to finish syncing.

After installation, the profile will be listed under Settings > General > Profile.

If you’ve been having Exchange sync issues under iOS 4, let us know if this does indeed resolve it for you.

[support.apple.com, thanks Doug!]

Apple wants you to get the most of your Keynote presentations when you move them from the Mac to the iPad, and they’ve put a Knowledge Base article to show you just how to do it.

From recommended themes to page sizes, fonts to image formats (PNG if you’re curious), to compressing the bits out of the various elements to keep the file size small enough for the iPad’s anemic memory.

If you live in Keynote on the Mac and the iPad, put these pro tips to use and let us know how they work for you!

[Apple via TUAW]

The UK’s Telegraph ran an article recently with a headline stating “Overheating iPhone 3GS: Apple blames the weather”… that could be a tad misleading. The Telegraph cites an Apple knowledge base article, last updated June 25, 2009, that warns about leaving the iPhone 3GS in hot places or using it under hot conditions, and shows a screenshot of the iPhone’s temperate warning screen,

The problem is, as longtime TiPb readers know, it’s the same knowledge base article that’s been up since the introduction of the iPhone 3G in 2008, the update merely adding in the newly launched iPhone 3GS.

So, while the iPhone 3GS may indeed have overheating problems — though we’re not experiencing any yet — saying Apple blames the issue on heating is, as mentioned, a tad misleading.

In any event, we’re more interested in whether or not our readers are experiencing iPhone 3GS overheating issues, and if so, what are you doing on the device when you experience them, and are you running a jailbroken device?

[via Engadget]

Apple’s Knowledge Base once again steps up in the handy-dandy reference chart department with a feature check-list showing highlighting some major features supported by all iPhone models, by the iPhone 3G and iPhone 3G S, and by the new iPhone 3G S alone.

There are some caveats, however:

1. Peer-to-peer connectivity requires compatible applications, which can be downloaded from the App Store when available.
2. The original iPhone does not support using Bluetooth for peer-to-peer connectivity. It can use Wi-Fi and cellular data networks for peer-to-peer connectivity.
3. MMS is not available in all areas; fees may apply. See your carrier for availability.
4. Internet tethering is not currently offered in the United States and some other countries. See your carrier for availability.

[via Daring Fireball]