A quick recap of modern SSL history might be a worthwhile context.
Not too long ago, SSL was only used on occasion. However, the insecurity of unencrypted traffic was unsustainable from the beginning, but SSL certificates were expensive and cumbersome to deploy. So, the industry started using self-signed certificates, especially on distributed devices. What this did to the average end-user, though, is it made the comfortable to proceed past the SSL warnings. This partially defeated the value of good SSL security.
We wanted to offer a good user experience and also avoid being a contributor to have end users be completely comfortable with going past all kinds of SSL warnings in browsers.
That's when we decided to introduce a real-world domain to be used for one purpose only: managing a router with our firmware from the inside of a network. That domain was mybox.management.
Adam Networks distributed the SSL certificate with each router, a solution far from perfect, but it did achieve our original purpose.
Along came letsencrypt.org, a wonderful solution to allowing anyone to obtain a free SSL certificate.
As of August 2018, mybox.management SSL certificate is no longer distributed on our gateways. On ASUS routers, firmware since August 2018 necessarily requires use of router.asus.com in order for changes to be saved. Furthermore, the initial setup also requires the use of a self-signed certificate at https://router.asus.com:8080 (when our firmware is used). In upcoming releases, letsencrypt will be available for each router, using [yourchoice].mybox.ai as a domain. However, that will only be available in the user interface after the initial setup via router.asus.com.
Furthermore, the http://mytools.management link, which is functional only inside your own network, has a MyBox option. That link is also automatically updated to point to https://router.asus.com:8080. When the letsencrypt feature is added in future firmware versions, this link will also auto-update and be retrieved from your subscription information.