Hi, is there a way to change the https (443) port to another ie: 8443
Welcome to Zyxel community!
GS1900 supports only standard https service port 443, it's unable to change to another port.
For remote access switch from Internet (WAN side), most people setup port forwarding (redirect port 8443 to 443) on router in their network instead. For access switch locally (LAN side), we think using standard port 443 should be enough because it's private network.
For your reference, our higher level switches series, such as GS1920, GS2210, and above, support to change service port for management protocols.
Hope it helps 🙂