A thread in Active Directory Lightweight Directory Services is waiting for the completion of a RPC made to the following ...

A thread in Active Directory Lightweight Directory Services is waiting for the completion of a RPC made to the following directory service. 
 
Directory service:
%1 
Operation:
%3 
Thread ID:
%2 
Timeout period (minutes):
%4 
 
Active Directory Lightweight Directory Services has attempted to cancel the call and recover this thread. 
 
User Action 
If this condition continues, restart the directory service.