Checked there're no third party firewall installed and the DNS record are correct. Able to PING those machines from Lansweeper server.
Run connection test and got the resulst like below
Remote WMI test
-----------------------------------------------
\root\cimv2 Remote WMI access test FAILED
The RPC server is unavailable. (Exception from HRESULT: 0x800706BA)
Remote Registry test using WMI
-----------------------------------------------
\root\default Remote WMI access test FAILED
The RPC server is unavailable. (Exception from HRESULT: 0x800706BA)