====== Ubuntu - Squid - Allow Specific Ports ======

You can find all ports that are allowed in the configuration file like this:

<file bash /etc/squid/squid.conf>
...
acl Safe_ports port 80
...
</code>

Consider adding Safe_ports ACL rule for any port that your clients need.

----

You can add a port range instead of writing a rule for every port like this:

<file bash /etc/squid/squid.conf>
...
acl Safe_ports port 6000-7000
...
</file>

----

===== Restart Squid =====

<code bash>
sudo systemctl restart squid
</code>