Hi Jean,
Although it looks like a user security issue , I would also suggest to check if the EIM adoptive procession server is correctly installed and you can see that is running in CMC. I had faced a similar issue where I had to manually run a script to get the EIM adoptive server installed. I dont remember the exact error message that I received but it is quite similiar to the one you are seeing. Please check the below post for more detail how I got it solved. Hope this helps.
http://scn.sap.com/thread/3305692
Thanks!!
Durga