No MQTT connection possible

Hi,

Can you support how to connect wled with mqtt?
I initially tried to connect iobroker. But now for faster testing purposes I use MQTT explorer.

WLED:
The IP inserted is the one of the PC where MQTT explorer is running. Firewalls deactivated.

I only get the message “Disconnected from server”

Regards
maxpd

MQTT explorer:

MQTT explorer: