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

win+r> wf.msc

COM+ Network Access (DCOM-In)
COM+ Remote Administration (DCOM-In)
File and Printer Sharing (Spooler Service – RPC)
File and Printer Sharing (Spooler Service – RPC-EPMAP)
Remote Event Log Management (NP-In)
Remote Event Log Management (RPC)
Remote Event Log Management (RPC-EPMAP)
Remote Event Monitor (RPC)
Remote Event Monitor (RPC-EPMAP)
Remote Scheduled Task Management (RPC)
Remote Scheduled Task Management (RPC-EPMAP)
Remote Service Management (NP-In)
Remote Service Management (RPC)
Remote Service Management (RPC-EPMAP)
Remote Rule for Remote Shutdown (RPC-EP-In)
Remote Rule for Remote Shutdown (TCP-In)
Remote Volume Management – Virtual Disk Service (RPC)
Remote Volume Management – Virtual Disk Service Loader (RPC)
Remote Volume Management (RPC-EPMAP)


http://www.itechlounge.net/2014/09/windows-computer-cannot-be-managed/

gpo

https://www.hammer-software.com/how-to-enable-file-and-printer-sharing-through-the-windows-firewall-with-advanced-security-using-group-policy/