How to change Port of Squid Proxy Server

Squid proxy server runs on port 3128 by default. Changing squid proxy server port to a non-standard port is a good idea as it will protect your proxy server from abusers and hackers.

Method 1

You can use the sed command to replace the port number

sudo sed -i 's/^http_port.*$/http_port NEW_PORT_HERE/g'  /etc/squid/squid.conf

In the above command, replace NEW_PORT_HERE with the port number you need.

For example, to run squid proxy on port 5555, run

sudo sed -i 's/^http_port.*$/http_port 5555/g'  /etc/squid/squid.conf

Now restart Squid Proxy server

sudo systemctl restart squid

If you have a firewall, you will need to open the port in the firewall.

Method 2: Manual Configuration Change

Edit Squid configuration file with vi or nano editor.

sudo vi /etc/squid/squid.conf

In the file, find http_port, it should look like

http_port 3128

Change 3128 to whatever port number you like. Save and exit the editor.

Restart the Squid Proxy server with the command

sudo systemctl restart squid

Open Port in firewall

If you have a firewall, you need to open the port in the firewall.

CentOS/AlmaLinux/RHEL

If you are using firewalld, you can use the command

sudo firewall-cmd --permanent --zone=public --add-port=8000/tcp
sudo firewall-cmd --reload

Replace 8000 with your squid proxy port.

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