How do I make bitcoind listen on 0.0.0.0:8332?

Try rpcallowip, instead of rcpallowip :)

Just had same problem.

Solved by setting

rpcallowip=*

in bitcoin.conf

have a look at https://en.bitcoin.it/wiki/Enabling_SSL_on_original_client_daemon

Are you certain bitcoind is not listening on 0.0.0.0 as well? On a fresh install here it's listening on 0.0.0.0:8333

$ sudo netstat --ip -lpa|grep bitcoin
tcp        0      0 localhost:8332     *:*       LISTEN      2909/bitcoind       
tcp        0      0 *:8333             *:*       LISTEN      2909/bitcoind      

Also, what does nmap from 192.168.2.6 say?