@Clive_A Thank you for checking. I will state specifically what I was unable to do. The default IP address of the switch was 192.168.0.1/24. This IP address is recognized as being set in VLAN1. In...

I changed the IP address of VLAN1 on the SG3428X without using the controller. When I did so, I can no longer communicate with the changed IP address or access the GUI. The PC's IP address matches...