Computer %1 cannot be managed. Verify that the network path is correct, the computer is available on the network, and that ...

Computer %1 cannot be managed. Verify that the network path is correct, the computer is available on the network, and that the appropriate Windows Firewall rules are enabled on the target computer.

To enable the appropriate Windows Firewall rules on the remote computer, open the Windows Firewall with Advanced Security snap-in, and enable the following Inbound Rules: 

COM+ Network Access (DCOM-In)
All rules in the Remote Event Log Management group

You can also enable these rules by using Group Policy settings for Windows Firewall with Advanced Security. For servers that are running the Server Core installation option, run the Netsh AdvFirewall command, or the Windows PowerShell NetSecurity module.