Question about "Authentication Failure"

Dear Colleagues,

This is same system What I previously escalated.

http://en.community.dell.com/dell-groups/dell_integrated_support/f/4551/t/19635821  

At OME Alert, "Authentication Failure" critical message occurred at same time.

The messages occurred at all EQL(13) and Blade Switch(3).

-Why This messages occurred?

-How to prevent this?

Please refer images below;