Baxter robot setup in Linux

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Hi, I'm a new user for the Baxter robot. Currently, I'm trying to setup the working environment on my computer by following the Baxter Wiki provide instruction. but until to the step of Verify Development Workstation Ping, I faced one problem. I can identify my ROS_IP but when I going to SSH to Baxter and verify the ability to communicate with my development PC, it shows me Persimmon denied. this is the code I follow:

$ ssh ruser@<our ROS Master>

# Password: rethink

# Example:
$ ssh ruser@011303P0017.local

of course, my ROS Master was different with the example. Then after that, it asks me to enter the password which is the rethink, but I try three times. in the end, shows me Persimmon denied.

Does anyone have the same problem before? By the way, I'm using ubuntu 14.04 64bit indigo and robot system version was 0.0.28

Thank you