What ports to enable for HTTP Proxy (update caching)

Apache HTTP Proxy, is a service that can be used in combination with ESET Remote Administrator 6 and later. It performs a similar role to the mirror server feature popular in older products (see our Knowledgebase article for more information). The pre-defined port for the HTTP Proxy service is port 3128.

More information about Apache HTTP Proxy:

What is Apache HTTP Proxy Server?

Apache HTTP Proxy installation - Linux