The total number of connections that were dropped because the limit on number of incoming connections from federated partner or clearing house was exceeded.
 
Causes
The network connectivity with federated partner of clearing house is unstable or an administrator of the remote domain has configured too many servers to communicate with your domain.
 
Resolutions
Check to resolve network connectivity problems with federated partner or clearing house or ask administrator of the remote domain to limit number of servers communicating with your domain .