Client Configuration Manager cannot connect to the machine "%1".%12 Possible cause: The client is not accessible. Solution: ...

%11Client Configuration Manager cannot connect to the machine "%1".%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 has the required privileges, as specified in the ConfigMgr Documentation.

Possible cause: A Client Push Installation account was not specified, the account is not valid, is disabled, or has an expired password.
Solution:  Ensure one or more valid and active Client Push Installation accounts are specified in the Configuration Manager console, that the account names and passwords are correct, and that the account has the required administrator rights on the target machines.%0