X11 error on login to RedHat Servers

I noticed that since the last set of patches many of my redhat 6 systems are reporting an X11 forwarding error after login:

X11 forwarding request failed on channel 0

To correct this problem you need to install the following package

yum install xorg-x11-xauth

I have not had the time to investigate why this is suddenly a problem.  When I have time I’ll report back the why.