I've setup the DimDIm virtual appliance on a windows machine with NAT. I've forwarded the ports correctly. If I start DimDim I cannot get to it from any computer outside of the windows computer. However, if I stop DimDim and start httpd - I can connect to it from any computer. The port forwarding works on 80. I don't know why I can get to the apache page but not DimDim.
try running ./Configure-ipaddresses.pl yourfqdn.com 80 <BR>
instead of using the IP address. That fixed a similar issue for me.<BR>
Of course you need to make sure that DNS is configured correctly.