Symptom
After updating or installing Mac OS X 10.2, your computer cannot dial out using the built-in modem. These three symptoms may occur:
1. When you try to dial up using Internet Connect, you see an alert box with this message:
"Internet Connect could not open the communications device."
2. The Internet Connection Log contains this entry:
"Failed to open /dev/cu.modem: Device busy."
3. The modem works normally if you start up the computer from Mac OS 9.
Solution
If you have not experienced the symptoms, you do not need to download the Mac OS X Modem Update.
The steps below use the copy of Mac OS 9 that is installed on the affected computer for downloading the update via modem. If you do not have Mac OS 9 installed, you should download the update (as in Steps 3 and 4) from another location, and copy it to a CD-R disc to take back to your computer. If you live near an Apple Store retail location, you may also get help there if necessary. For portable computers, consider going to a location where you could download the update via Ethernet (which includes common broadband Internet services such as cable and DSL).
To download and install the Mac OS X Modem Update, follow these steps:
1. If you have Mac OS 9 installed on the computer, start up the computer from Mac OS 9. For help, see technical document 106667, "How to Switch Between Mac OS 9 and Mac OS X".
2. After the computer starts up, connect to the Internet. If you have not previously connected to the Internet in Mac OS 9, see technical document 106869, "Mac OS 9: How to Connect to the Internet via PPP (Dial-Up Access)."
3. Go to Apple Featured Software (http://www.apple.com/swupdates/).
4. Search for "Mac OS X Modem Update".
5. Click the "Mac OS X Modem Update: Information and Download" document link.
6. Read the instructions, then download the update. If given the option to decompress the file after downloading it, click Cancel.
7. Restart the computer from Mac OS X. For help doing this, see technical document 106667.
8. Open the Mac OS X Modem Update, and follow the directions.
Legal information
The Mac OS X Modem Update license agreement permits the reproduction of software once for archival purposes only.
Related documents
25438: "
Mac OS X 10.2: Modem - 'Could not Open the Communications Device' Message (Bluetooth)"