Dynamics AX 2009 BC error ID 180

hi,

 My event log receive thousands BC errors ID 180. My architecture is: two AOS server on virutals machine, DB server and on another server with reporting services for AX. On server with reporting service I receive this errors.

What is reason of this errors? I need some hints to start resolve the errors

error:

Microsoft Dynamics AX Business Connector Session 18.

RPC error: RPC exception 1722 in Ping occurred in session 1048