As the internet matured, the landscape that birthed hostnames like mysk2.dyndns.org shifted. Security concerns regarding open ports on home routers led to the rise of Virtual Private Networks (VPNs) and "cloud-tunneling" services. Furthermore, many free DynDNS tiers were phased out as the service was acquired by enterprise-level companies like Oracle.
If you try to access a home security camera or a private server while away, you might find the address has changed, locking you out. Mysk2 Dyndns Org 3