Hello everybody
i have to set a Firewall for my squid box , but to write rules i have to know all ports needed by this
i know that squid listen on port 3128
and he get responses to it's http requests from port 80 , thus i write this :

iptables -F
iptables -A INPUT -p tcp --sport 80 -j ACCEPT
iptables -A INPUT -p tcp --sport 8080 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j ACCEPT
iptables -A INPUT -p tcp --dport 8080 -j ACCEPT
iptables -A INPUT -j DROP

but this blocked me squid !

have u some advices to give me please ?.

Why are you allowing 8080? That's typically a Windows HTTP proxy.

You need to allow your own users to connect, so there should be a rule to allow traffic sourcing from your own network to dport 3128. As long as you have the appropriate contrack modules loaded, iptables should allow SQUIDs outbound connection and the corresponding reply.

because i changed the default 3128 to 8080 in squid.conf and i did a copy past without seeing this details
well i know i have to allow squid get clients replys from the net but the problem is simply HOW ? or what ports should be opened ?