In the past %3 hours, Client Configuration Manager has made %1 unsuccessful attempts to install the ConfigMgr client "%2". ...

%11In the past %3 hours, Client Configuration Manager has made %1 unsuccessful attempts to install the ConfigMgr client "%2". CCM will continue to attempt to install this client.%12

Possible cause: The client is not accessible.
Solution: Verify that the client is connected to the network and that the site server computer account or (if specified) the Client Push Installation account have the required privileges, as specified in the ConfigMgr Documentation.%0