Can't use polipo from other PCs on the network

I'm trying to setup polipo on my network, and from my PC (where it is installed) it works fine but I can't get it to work on the other computers. The test computers are:

 - PC with polipo: 192.168.1.20 (prompt: [rainct, XX]$)
 - PC without polipo: 192.168.1.10 (prompt: rainct@OFICINA:~$)

/etc/polipo/config
------------------

proxyAddress = "127.0.0.1" # IPv4 only

# If you are enabling 'proxyAddress' above, then you want to enable the
# 'allowedClients' variable to the address of your network, e.g.
# allowedClients = 127.0.0.1, 192.168.42.0/24

allowedClients = 127.0.0.1, 192.168.1.0/24

[...]

Test
----

[rainct, tr]$ http_proxy='http://localhost:8123' w3m eurion.net; echo $?
0

rainct@OFICINA:~$ http_proxy='http://192.168.1.20:8123' w3m google.com
w3m: Can't load google.com.

rainct@OFICINA:~$ http_proxy='http://192.168.1.20:8123' w3m 64.233.187.99
w3m: Can't load 64.233.187.99.

/var/log/polipo.log
-------------------

No related output.

Port check
----------

rainct@OFICINA:~$ nmap 192.168.1.20 -p 8123

Starting Nmap 4.53 ( http://insecure.org ) at 2008-08-31 14:49 CEST
Interesting ports on 192.168.1.20:
PORT STATE SERVICE
8123/tcp closed polipo

Nmap done: 1 IP address (1 host up) scanned in 0.495 seconds

Firewall
--------

[rainct, tr]$ sudo iptables --list
Chain INPUT (policy ACCEPT)
target prot opt source destination

Chain FORWARD (policy ACCEPT)
target prot opt source destination

Chain OUTPUT (policy ACCEPT)
target prot opt source destination