3 Answers. Sorted by: 1. Check this list of unassigned ports https://www.iana.org/assignments/service-names-port-numbers/service-n... Information Security Stack Exchange DirectAthletics
In some instances, bad actors attempt to utilize port 11501 for CORS attacks if a user visits a malicious website. However, modern browsers sandbox localhost requests strictly, and Ubiquiti has patched most legacy CORS vulnerabilities in the discovery protocol. http localhost 11501
: Sometimes local DNS issues prevent localhost from resolving. Try navigating to http://127.0.0.1:11501 instead. Managing Localhost Connections 3 Answers