ROS Fuerte in Multiple machines

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Hello,

In ros fuerte i can't communicate from slave to the master! can someone help-me?

I have in the bash script for master this:

export ROS_IP=192.168.55.112
export ROS_MASTER_URI=http://192.168.55.112:11311

at the slave the same. In the slave i make rostopic list and i see all publications.

but when i run a node, in the slave pc, that should publish something, the master can't ear anything! (if run the publisher in the master and subscriber in the slave it works, the inverse not!!!!)

If i run the same node in the master everything runs ok! What could be the problem?