JsonpRequestBuilder Timeout - GWT 2.0

Hello!
I'm trying to retrieve Json using JsonpRequestBuilder.
When I use some external url, like this one http://search.yahooapis.com/ImageSearchService/V1/imageSearch?appid=YahooDemo&query=Madonna&output=json, everything works fine.
But, when I try to fetch json from some server inside my network, I get timeout error (Timeout while calling http://192.168.2.12/gwt.js).

When I check the request on firebug, I can see that the response came back and its body is exactly what I was suppose to receive. Somehow, it is not being handled by the callback function.

If I try the same URL through browser, it works fine.

Does anyone know what it can be?

Marcio

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