I had a similar, but not completely identical error. Maybe my solution will address your problem as well. I wrote about it on this post:
WebSphere Admin Port Issues When Connecting
Hmmm....Just got an update as I submitted that.
Apparently, the problem is documented in the readme for IRAD. After doing the update, you have to delete the WAS server that is created with the IRAD server installation, create a new WebSphere Portal Server in the server perspective, and then bounce IRAD, stopping and starting it again.
Then, you need to initialize the server status. Not sure why, but you do. And apparently, you have to do that little initialize server status step in the server perspective every subsequent time you start up IRAD.
Sounds reasonable and straight forward. Surprised I didn't just do that on my own.
-Cameron McKenzie