Firstly all devices are ON and have an active/working network connection.
Secondly the device I'm trying to ping from is pingable from the devices I'm trying to ping!
Right, we have a secure VPN tunnel using a Cisco ASA 5500 which has a working VPN connection to a remote location, the remote location is on a 172.21.79.0 subnet. On our side we have a server than shouljd be able to ping IP's within this subnet, some IP's work, some don't.
The server is setup on the VPN connection as 10. address, it also has a domain connection on a 172.16 address. I've noticed that if I disable the domain connection all works fine, but if the domain connection is enable certain IP's on the 172.21.79.0 subnet are no longer pingable.
Thats the problem, I think the 2 network cards on separate networks is causing it.... but I'm stumped on how to fix it.
Another thing I should mention is that the server is running as a virtual machine in Hyper-V.