I am trying to setup a lab to test Exchange Server. I am running Exchange Server on a VirtualBox virtual machine.
On the virtual machine, I have selected Bridged networking. I can get to the internet, can ping my host machine, router, etc.
My host machine is 192.168.1.10 and the virtual machine is 192.168.1.51.
I setup port forwarding on my router/firewall to forward port 25 to the virtual machine's ip. I also have public dns pointed to the external ip of my router/firewall.
I tried a telnet <my domain name> 25 and it failed. I also tried telnetting from my host machine on the same subnet. That failes to. If I run the telnet command on the Exchange server itself, it responds, so it is listening on port 25.
Since I can't telnet from the host machine, I think it must be something to do with the way I have networking setup on the virtual machine.
By the way, Windows Firewall is disabled on all machines.