Unable to proxy Instant Messaging after upgrade to Fedora 4

[dfcamara at ic.unicamp.br]

I used to proxy my instant messaging (IM) throw Squid in Fedora 3 and it
worked fine. What I did was to enable CONNECT in any port, not only to the
listed SSL ports. So, I commented the following line in
/etc/squid/squid.conf:

# Deny CONNECT to other than SSL ports
#http_access deny CONNECT !SSL_ports

Now I know a better approach is to list the ports I use in my IM client
(Gaim) in the list of allowed SSL ports and let Squid deny other ports.
i.e. include ports 1863 (MSN), 5190 (AIM/ICQ) and 5222 (Jabber) in
SSL_ports:

acl SSL_ports port 443 563 1863 5190 5222
# Deny CONNECT to other than SSL ports
http_access deny CONNECT !SSL_ports

Now that I've upgraded to Fedora 4 (in fact I did a fresh install), I can
no longer proxy IM throw Squid, now I'm receiving 503 (service
unavailable) errors:

/var/log/squid/access.log:
1120832745.447   5004 127.0.0.1 TCP_MISS/503 0 CONNECT jabber.org:5222 -
DIRECT/- -
1120832748.639    256 127.0.0.1 TCP_MISS/503 0 CONNECT
login.oscar.aol.com:5190 - DIRECT/- -
1120832762.732    527 127.0.0.1 TCP_MISS/503 0 CONNECT
messenger.hotmail.com:1863 - DIRECT/- -

I'm running Gaim (IM client) in the proxy host for testing purposes. If I
disable proxy in Gaim it connects, indicating there is no problem with the
connection itself. but when I switch it to use proxy, I receive the errors
above.

Any ideas?