I have referenced both of those articles.

https://www.clearos.com/resources/documentation/clearos/content:en_us:7_ug_web_proxy

https://www.clearos.com/resources/documentation/clearos/content:en_us:kb_o_clearos_guides_setting_up_content_filter_policies

Neither seems to have any information on reconfiguring the ports that the two servers/services run on.

I have edited the following files:

/etc/dansguardian-av/dansguardian.conf

# the port that DansGuardian listens to.
filterport = 3128

# the port DansGuardian connects to proxy on
proxyport = 8080

and

/etc/squid/squid_http_port.conf

# Created automatically based on network configuration
http_port localhost6:8080
http_port localhost4:8080
http_port 192.1.1.10:8080

This has switched the two services around so that the Web Filter is listening on tcp/3128 and forwarding the requests to the proxy on tcp/8080 and proxying and filtering is working.

I need to now adjust the Filter and Proxy report as it has not updated any values since I made the changes. Where are the configuration files for this application?