The phrase is a specific Google Dork —a search query designed to find vulnerable or public-facing internet-connected devices.

is a legacy control and viewing page for older Axis devices, such as the AXIS 2400/2401 Video Server Functionality

has made finding unsecured IoT devices much easier than using traditional Google searches. In summary, while the indexframe.shtml

What is Google Dorking/Hacking | Techniques & Examples - Imperva

: The keyword could also lead to forums, support pages, or technical documentation that help in troubleshooting issues related to Axis video servers, especially those involving updates or add-ons.

Axis produces:

If you must use port forwarding, configure the device’s "IP Address Filter" settings to only allow connections from your specific, trusted IP addresses.