Server not accessible from the internet

[olivierdb]

3 minutes or so after starting the server, the "Network Accessibility
Information" shows a green tick and the message: "The server is
accessible from the internet...". But, 10 seconds or so thereafter,
the green tick is replaced by a red cross and I get the message: "This
server does not seem to be accessible from the internet...". I have
enabled port forwarding on my router (using port 55555) and allowed
all incoming connections to iGet Mobile in my firewall software on my
iMac. I can't find what's wrong with my settings! Could this be a bug?
Please help!