Resurfaced by PR: https://github.com/modcluster/mod_proxy_cluster/pull/337

The default ports selected for debugging are causing several issues:

• Port 6666: This port is commonly associated with IRC, but is also known to be used by malware, which could raise security flags. It is blocked by default by browsers such as chrome and we had separate FAQ item to address that.
• Port 8000: This port is the default for Tomcat's JPDA (Java Platform Debugger Architecture), creating a conflict in a default setup. This port is used by the demo by default as the proxy port.

These port selections appear to have been made without sufficient consideration, leading to potential conflicts and end-user issues.

The suggestion is to use port 8090 that is used by WildFly/EAP/Undertow as the MCMP default host port.