Service Desk Plus logs out when Desktop Central is running

Service Desk Plus logs out when Desktop Central is running

Hi there,
 
When I log in to both Service Desk Plus and Desktop Central at the same time, one or the other kicks me out and forces me to log in again each time I go back to it - even after less than a minute. 
 
I am using the same domain login for each...and am opening them in different tabs of IE.
 
Any ideas?

                  New to ADSelfService Plus?