Than ks guys for your fast answer.
yes port is different, configured in both settings files.
Startup logs was normal.
In the mean time, I had to move from home and hte issue disappeared. What was done:
- PC reboot
- Internet connection change from shared mobile connection to direct box connection (but Node-Red usage through is same connection was fine till now.
I don't know if one these actions fixes the problem.
In another hand, I had an Open VPN connection active (not related to Node-Red server access). But once again, it is not the first time I use Node-Red in addition to this VPN. Maybe it comes in some starting scenario (like VPN open before Node-Red first acces! or something else!..)
Maybe we can live this disccussion if anybody else faces the same problem. And if I fall bacl into this again, I will post a new message.
Once again, thanks for your time (good to work on solutions where we can count on gentlemen help).