Networking :: Lighttpd Breaks After Large System Update?

I am not fully sure if this belongs more to the networking section or the software. O hope it is related to here enough.

My problem is as the topic says.

My port 80 seems to be already taken. lighttpd fails to start reporting that it cannot bind to port cause its already taken.
The error message itself:

Code:
"Starting web server: lighttpd2010-02-21 07:01:02: (network.c.345) can't bind to port: :: 80 Address already in use failed!"

I am not able to crack this by myself. Ihve tried investigating this by

Code:
lsof -i :80
netstat -ape | grep -v unix

First doesn't show anything second anything abt port 80.

Now hints I can think of. Maybe you have more experience and ideas what I can do and where should I look for the culprit.

I am using debian (unstable) and lighttpd. I even tried rebooting; it says that the port is taken already at the boot sequence (well it starts pretty much at end anyway but the system should be clean).

It seems that it started failing after a major distro update, so maybe there are some conflicts based on ipv6/v4 or something, though I have no idea what it could be. Well my hit for that is the part of error msg "bind to port: :: 80 ". This "::" looks like ipv6 naming convention. Maybe its lighttpd internal.