Wired port cannot establish TCP connections

I have come across an error that I have so far been unable to solve via google/searching forums.
From time to time, the wired port loses the capability to establish TCP connections. I can ping fine, I can resolve names fine indicating that at least UDP 53 is working. It's impossible to complete a three way handshake for any TCP connection, be it SSH, HTTP, FTP or anything else. This happens randomly after a network connection has been working fine for days. The Internet Connection Wizard claims everything is peachy as it probably just performs a ping to some site.
A reboot does not fix the problem - what does fix it is unplugging the cable, changing to wireless and associating with a network, opening a connection, then shutting down AirPort again and plugging the cable back in. Just replugging without establishing a TCP connection via AirPort does not work.
Is there anything I am missing here? Should I be contacting an Apple Store to talk about repairs/replacements?
Thanks for your time and consideration, if there's any other information needed to make light of the problem, I will post it as soon as I see the request. Unfortunately, I cannot produce the problem at will and have so far neglected running a traffic sniffer to look at exactly what is happening on a packet level - tho "telnet server 80" times out when "ping server" works fine.

Well, I have gotten the FMS on Windows to work via my basic client app (via localhost in the NetConnection call). Taking the same SWF and specifying the external IP of the Windows machine doesnt work.
So I am kind of back to square one.
I made sure that the default Adaptor is bound to any IP (using ":1935,80" in the default Adaptor.xml HostPort tag). So FMS should be bound to all network interfaces.
Just to clarify: FMS is running in "development" mode. Does that mode prevent external connections?

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