i like your book very much. i able to connect properly on chapter 8 to jabber.org but for chapter 9 ,chapter 7, chapter 11, my firebug give me below error

15, securityError, A security sandbox error occured with the flXHR request.
http://10.1.1.2/~user/metajack/scripts/flensed.js
Line 12

is there something wrong with the code?

What BOSH service URL are you attempting to use? The one in the book (http://bosh.metajack.im:5280/xmpp-httpbind)?

This looks like a simple security policy violation. Did the other chapters work just not this one?

Yup, i'm using the default bosh you specified. I use it to connect to jabber.org. for chapter 8, it's ok, but other 7,9,11 chapters not ok. how to troubleshoot this?

It appears you are accessing you application from http://10.1.1.2/~user/metajack/foo

Is that correct? The flash plugin will not work if you attempt to access the app from a file:// URL.