In our lab we have a server exposed to the internet with three ports forwarded by our Gold to the server (2211, 2212, 2213).
The server is running VirtualBox with three RedHat Enterprise Linux VMs. (192.168.1.211; 192.168.1.212; and 192.168.1.213). From the LAN we can connect all the SSH connections we want to any of the three virtual RHEL servers. This shows that the port forwarding on VirtualBox is all correctly set up.
There are times when we attempt to establish multiple internet connections and we get a Network error: Connection refused. or other failure message.
How can we see why this is being blocked after a single connection is already established? The logs are a bit wonky to find the internet traffic that is being forwarded (or should be forwarded).
Here is a diagram of our network.
The other maddening situation is that the Gold doesn't see the VMs consistently. On boot it typically does but after a while it shows them offline - even when they can be pinged. They all have unique IP and MAC addresses.
Any ideas on that too?
The servers are very much up and running ....
... yet being reported offline.
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