Cannot connect to DCOM port 135 error

[kungfupanda]

We get "Cannot connect to DCOM port 135 : Firewalled?" errorfrom multiple machines. We checked that the firewall were turned off.

[kungfupanda]

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
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\root\cimv2 Remote WMI access test FAILED
The RPC server is unavailable. (Exception from HRESULT: 0x800706BA)

Remote Registry test using WMI
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\root\default Remote WMI access test FAILED
The RPC server is unavailable. (Exception from HRESULT: 0x800706BA)

[Hemoco]

The problem could be

1) Windows firewall not turned off (check with "netsh firewall show state")
2) a Third party firewall
3) dns problem, check if the ip address shown in the error is the correct IP.