Squid Proxy Server allow connection to all ports

By default Squid proxy only allow out going connection to white listed ports that are used commonly. When you visit a site with non standard ports with Squid proxy, it won’t work. To fix this, edit squid configuration file

vi /etc/squid/squid.conf

Find

acl SSL_ports port 443
acl Safe_ports port 80          # http
acl Safe_ports port 21          # ftp
acl Safe_ports port 443         # https
acl Safe_ports port 70          # gopher
acl Safe_ports port 210         # wais
acl Safe_ports port 1025-65535  # unregistered ports
acl Safe_ports port 280         # http-mgmt
acl Safe_ports port 488         # gss-http
acl Safe_ports port 591         # filemaker
acl Safe_ports port 777         # multiling http

Replace with

acl SSL_ports port 1-65535
acl Safe_ports port 1-65535

Restart squid with

systemctl restart squid

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