I answered this one here , but I thought it was worth republishing, as many Windows users have problems after configuring correctly.
In my case, it was a process running on my machine (Windows 7) that used port 9000, already named aeagent.exe
I changed the php.ini setting to "xdebug.remote_port = 9001", made the corresponding change in netbeans, and then restarted Apache. Now it works.
Thanks to the SysInternals TCPView tool.
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