#IPMI
There are a few more ports you need to open. You are probably getting the error because the HID port is not open. Please find the port list below:
TCP Ports
HTTP: 80
HTTPS: 443
Video - 5901
Hid – 5900 (Human Interface Device) port is the KBD/mouse port.
CD – 5120
Floppy – 5123
UDP ports:
IPMI: 623