The group membership cache refresh task did not locate a global catalog in the preferred site, but was able to find a global ...

The group membership cache refresh task did not locate a global catalog in the preferred site, but was able to find a global catalog in the following available site. 
 
Preferred site:
%1 
Available site:
%2 
 
This event log message could be caused by temporary network outages. 
 
User Action 
If this condition continues, verify that the scheduling information is correct or consider reconfiguring the preferred global catalog site.