I've tried all above and it doesn't work.
Preview on my own system is fine, it just can't work over local connection.
I checked my computer's local network ip, too.
I guess the only way to test my game is to export it, period
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I read the tutorial on
scirra.com/tutorials/247/how-to-preview-on-a-local-network
I did everything accordingly and it still says "Unable to start HTTP server on '192.168.0.100' port 50000 (5)
Has anyone experienced the same issue? what am I missing?