Updated iTunes to 11.0.3 and now when I try to use Airport Express I get a message in iTunes that states, "an unknown error has occured (-15000.)  I gave the Airport a hard re-start, so I don't think that is the issue.  Using Windows 7.

Updated iTunes to 11.0.3 and now when I try to use Airport Express I get a message in iTunes that states, "an unknown error has occured (-15000.)  I gave the Airport a hard re-start, so I don't think that is the issue.  Using Windows 7 Ultimate

Looks like I fixed it., thanks to another post I read.  I went into my Norton Security.  Under Settings. Chose Firewall. Program rules. changed the itunes setting from "auto" to "allow"  This also fixed my error (-3212) which would not allow me to connect to the iTunes store. 

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