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Archived - Error -3256 or -15000 when streaming to AirPort Express base stations using iTunes

This article has been archived and is no longer updated by Apple.

Symptoms

While configuring iTunes to stream music to an AirPort Express, you may be presented with the following dialogue: 

"An error occurred while connecting to the remote speaker 'speaker_name'. An unknown error occurred (XXXX)."

XXXX might be "-3256" or "-15000."

This article applies to iTunes 6.0.2 or later.

Resolution

This dialog may occur if the Mac OS X Firewall is configured to block UDP traffic or is not configured to "Set access for specific services and applications."

To resolve this issue, first confirm that your AirPort Express base station is running the most recent version of firmware:

  • If you have an 802.11n capable AirPort Express, install firmware 7.3.2.
  • If you have an 802.11g capable AirPort Express, install firmware 6.3.

The steps necessary to resolve this issue vary depending on whether you are running Mac OS X 10.4.11 or 10.5.1 or later.

Mac OS X 10.4.11:

  1. From the Apple menu, choose System Preferences.
  2. From the View menu, choose Network.
  3. Select the network interface you use to connect to your Express base station - either AirPort or Ethernet.
  4. Click the Configure button.
  5. Click the Configure IPv6 button at the bottom of the window.
  6. If IPv6 is set to Off, set it to Automatically or Manually depending on your network configuration
  7. Click OK.
  8. Click the Show All button at the top of the window.
  9. From the View menu, choose Sharing.
  10. Select the Firewall tab and click the Advanced button.
  11. Confirm that the checkbox next to "Block UDP Traffic" is not selected. If it is, uncheck that box
  12. Click OK.

Mac OS X 10.5.1 or later:

  1. From the Apple menu, choose System Preferences.
  2. From the View menu, choose Network.
  3. Select the network interface you use to connect to your Express base station - either AirPort or Ethernet.
  4. Click the Advanced button and select TCP/IP in the new window.
  5. Confirm that the pulldown menu next to Configure IPv6: is set to Automatically or Manually depending on your network.
  6. Click OK.
  7. Click the Show All button at the top of the window.
  8. From the View menu, choose Security.
  9. Select the Firewall tab.
  10. Choose the radio button "Set access for specific services and applications."
  11. Close the Security window.

 

Last Modified: May 14, 2013
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  • Last Modified: May 14, 2013
  • Article: TS2278
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