After upgrading to iTunes 8, my music streaming from iTunes to my stereo stopped working. I was getting the following error:
"An error occurred while connecting to the remote speaker ‘speaker_name’. An unknown error occurred (-3256)."
I was running the latest firmware (6.3) on my Airport Express, and running iTunes 8.0 on Windows Vista SP1. I tried reinstalling iTunes, AirPort Admin Utiliity, turning off AirTunes on the AirPort Admin utility, then turning it back on, but I was still getting the same error.
Finally I found info about the error in the Apple forums here: http://discussions.apple.com/thread.jspa?messageID=8225777 Upon investigation, it looked like that windows firewall was blocking the ports I needed. But I knew my Windows Firewall Service was disabled (I know, I know, bad me…)
I tried to start the windows firewall service, and it failed with the following error in the System Event Log:
The Windows Firewall service terminated with service-specific error 5 (0x5).
UGH. Found the following MS article: http://support.microsoft.com/kb/943996 Fixed the registry keys as required and got my firewall service started, and AirTunes worked!
I discovered iTunes 8.0 will not connect to remote speakers (at least on Windows Vista) if the Windows Firewall service is disabled or stopped. I verified this by disabling the service again, and AirTunes stopped working. Once I started the service, I was able to stream music. yay