I'm currently puzzling over the same thing. I'm wondering if firestarter
is perhaps reading the logs and deciding a long-gone connection whose
opening was recorded in them has never closed? I had this problem on
gutsy, now I'm having it on hardy.

I have no idea where firestarter is getting its information. It's still
not impossible that it knows something we don't! I did look in
/proc/net/tcp, you just need to convert the port number to hex (run bc,
set obase=16, then type the port number and bc will spit it out in hex)
before you can look for it in the proper column (*_address) and I didn't
find my connection there. As far as I know, /proc "knows" everything
that the kernel knows about connections.

Erk, as I write this I am trying more things. In /proc/net/ip_conntrack
I find my connection:

tcp      6 201847 ESTABLISHED src=192.168.1.23 dst=98.204.109.154 sport=37835 
dport=30541 packets=1 bytes=164 [UNREPLIED] src=98.204.109.154 dst=192.168.1.23 
sport=30541 dport=37835 packets=0 bytes=0 mark=0 secmark=0 use=1
tcp      6 201858 ESTABLISHED src=192.168.1.23 dst=98.204.109.154 sport=37853 
dport=30541 packets=1 bytes=136 [UNREPLIED] src=98.204.109.154 dst=192.168.1.23 
sport=30541 dport=37853 packets=0 bytes=0 mark=0 secmark=0 use=1

I have no idea what this is or where it came from. There's also matching
(?) entries in /proc/net/nf_conntrack. No program is listed by
firestarter, so it seems like this is a phantom connection... I'd very
much like to know where it came from, though.

-- 
Closed connections shown in "Active connections"
https://bugs.launchpad.net/bugs/112334
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