I have a main office lan that is connected to all remote subnets with a Sonicwall site to site vpn.
I can ping from the main lan to the remote lans and back.
My Bitdefender on a remote machine detected and blocked the port scan from spiceworks invenory manager, so I turned off block port scanning for testing. Now when I try to rescan the machine it just says firewalled. Nothing else. I can ping and ping from this specific machine.
I do have a rule in place in the policy to allow all traffic from the server IP I am using for Spiceworks server, which seems to work fine with all of the local machines on the main lan subnet. But on remote subnets it seems like I get the IP, the name of the PC (most of the time), and that is it. No OS detection or anything like that. I am using a local admin account for these machines when I select "rescan"...