I am starting with Node-Red two weeks before and had good succes.
My System: Rasberry PI 4, MQTT Mosquitto Broker, Node-Red, 8266 Wifi Module.
Today I had a complete hangup of Node-Red Editor. Node-Red adaptor installation on Pi 4 does not show any problems. I had been very lucky because some minutes before I had exported my complete flow. So nothing really lost.
I followed many hints from the net but without any success. Then I found one hint to the port.
So I changed in the Node-Red setting file the Port from 1880 to 1881. After Pi 4 restart the Node-Red Editor was working perfekt under the localadress:1881 together with the uploades previous flow and also the dashboard was OK. Only the MQTT messages from 8266 had been not available.
Then I changed back to Port 1880 and could reproduce that Node-Red editor is not working.
But after going to new Port 1881 now also here the Node-Red editor is not working.
And also changing to Port 1882 does not help.
Can anybody tell me what could be the problem behind.