Philipp’s posterous

How do I open a TCP port on a Ubuntu physical machine (host) for a Win virtual machine (guest)?

So here's my problem: I have a Windows 2003 guest virtual machine running under VMware Server 2.0 64bit. The host machine is Ubuntu 8.04 where I have a custom web server running under TCP port 54321.

With both bridged and host-only networking, the (Windows) guest machine can ping the (Linux) host machine -- but cannot connect to the aforementioned TCP service (neither via Telnet nor a web browser). In both bridged and host-only networking scenarios, the two machines (virtual and physical) obviously belong to the same virtual LAN so they can ping each other. I suppose my Ubuntu is, per factory defaults, "over-configured / secured". How do I open this specific port for clients from these virtual networks or just from the LAN in general?

Without knowing much about iptables, I tried both
sudo iptables -I OUTPUT -p tcp --source-port 54321 -j ACCEPT
sudo iptables -I INPUT -p tcp --destination-port 54321 -j ACCEPT

which, from some googling, people sometimes seem to use for other ports like MySQL or BitTorrent. Didn't help with my particular problem in the VMware scenario I just described.

Any pointers gladly appreciated!

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