ipv6: can't connect to myself?!

I can't connect() to my own link-local address.
connect just hangs.

Before some wise guy now tells me I should be connecting to ::1 instead:
"oh, really!" ;) The application is npush/npoll from my ncp program suite, which can be found at http://www.fefe.de/ncp/.

Basically, the sender sends UDP announcements and the receiver connects to the IP of the announcement on the interface of the announcement.

strace of the receiver reveals that it hangs in the connect() call.

Any takers? Why does this not work?

Felix