Red Hat Training

A Red Hat training course is available for Red Hat Enterprise Linux

16.4. Configuring a Domain Blacklist in Squid

Frequently, administrators want to block access to specific domains. This section describes how to configure a domain blacklist in Squid.


  • Squid is configured, and users can use the proxy.


  1. Edit the /etc/squid/squid.conf file and add the following settings:
    acl domain_blacklist dstdomain "/etc/squid/domain_blacklist.txt"
    http_access deny all domain_blacklist


    Add these entries before the first http_access allow statement that allows access to users or clients.
  2. Create the /etc/squid/domain_blacklist.txt file and add the domains you want to block. For example, to block access to including subdomains and to block, add:


    If you referred to the /etc/squid/domain_blacklist.txt file in the squid configuration, this file must not be empty. If the file is empty, Squid fails to start.
  3. Restart the squid service:
    # systemctl restart squid