Some Polycom We Interface's can only be reached through HTTPS, whereas some won't allow access to the Web Interface at all. This is because Polycom introduced the option to utilize only HTTPS, or to disable the Web Interface entirely. Not to worry though, there is a way to switch this back on!
Enter the admin password (by default this is 456)
Select Administration Settings
Select Web Server Configuration
This menu will either allow you to either only enable HTTP, or only HTTPS or both
Or to disable this again